Most fast food milkshakes aren’t made with ice cream. They’re made with a proprietary soft-serve mix — a formulation with stabilizers, emulsifiers, and a specific fat percentage engineered to pour smoothly from a machine. It’s not bad. It’s just not ice cream.

Five Guys starts with a vanilla ice cream base. The distinction shows in texture and richness: the shake has the density of real dairy fat and the aroma of vanilla ice cream rather than the slightly flat sweetness of a soft-serve mix. It’s also why the home version works — you can replicate what they’re doing because what they’re doing is fundamentally the same as what you’d do in your kitchen. Buy good ice cream, blend it with a small amount of milk, and add whatever mix-in sounds right.

The spindle blender (a tall metal cup on a spindle machine, not a traditional blade blender) is the other hardware difference. The spindle machine doesn’t cut; it whips. This produces a different texture than a household blender on high — denser, less aerated. At home, you can approximate this by using a regular blender on its lowest speed for the minimum time required to reach uniformity.

Five Guys offers 11 mix-ins as of 2026. All are included in the base shake price; no upcharge per mix-in.

Chocolate — 50g, +133 cal. Chocolate syrup blended in, not a chocolate ice cream base. A straightforward chocolate milkshake result; the vanilla foundation keeps it from being as intense as a pure chocolate ice cream shake. Works well paired with peanut butter or coffee.

Peanut Butter — 50g, +322 cal. The highest-calorie mix-in after Oreo Crème, and the most ordered for good reason. Peanut butter in a vanilla shake is natural, rich, and not too sweet. The 322-calorie addition is substantial — this turns a 670-cal shake into a 992-cal one before anything else. Use fresh peanut butter at home (not old/dry jar residue) to get the flavor right.

Bacon — 14g, +70 cal. The most unusual mix-in and Five Guys’ calling card. Cooked crispy bacon crumbled into a vanilla shake sounds like a stunt but works — the salty, smoky bacon pieces function like a crouton in soup: crunchy contrasting texture, savory note against sweet. The combination with peanut butter is the canonical Five Guys order. Use genuinely crispy bacon — not chewy, not undercooked. Undercooked bacon in a cold shake is unpleasant.

Salted Caramel — 50g, +155 cal. A caramel sauce with salt. Balanced, sweet, slightly bitter from the caramel. Popular on its own or paired with Oreo Cookies for a sweet-salty combination.

Oreo Cookies — 25g, +120 cal. Crushed Oreo pieces (the chocolate wafer part). Adds texture and the chocolate-cookie flavor without the intensely sweet creme. A standard milkshake mix-in.

Oreo Crème — 50g, +320 cal. This is the creme filling from Oreo cookies, not the whole cookie. Intensely sweet and fatty. One of the highest-calorie mix-ins. The result is very sweet; better combined with something that provides contrast (bacon, coffee, or fresh fruit) than consumed straight.

REESE’S Cups — 28g, +150 cal. Chopped REESE’S Peanut Butter Cups. Overlaps significantly with peanut butter (same flavor core) but adds the chocolate coating contribution and the texture of the cup pieces. Pairing REESE’S Cups with additional peanut butter is extremely rich — this is the maximum peanut butter move.

Strawberries — 60g, +90 cal. Fresh strawberries blended in. One of the lighter mix-in options by calorie. Works well as a standalone (classic strawberry shake on a vanilla base) or combined with banana for a smoothie-style result.

Bananas — 80g, +160 cal. Half a banana blended into a vanilla shake produces a recognizable banana milkshake with natural sweetness. The banana rounds out the vanilla in a way that feels more substantial than a single mix-in should. Good with peanut butter.

Coffee — calorie data not published separately by Five Guys. Strong brewed coffee or espresso blended into the vanilla base produces a coffee milkshake. The bitterness of the coffee balances the sweetness of the vanilla ice cream well. Good paired with chocolate for a mocha. Use brewed coffee (not a pre-sweetened coffee drink) to control sweetness.

Blackberry — calorie data not published; described as made with Marion blackberries from Oregon. Availability may be seasonal or regional. A fruit-forward, tart option when available — a genuine flavor departure from most of the other mix-ins.

Peanut Butter + Bacon — The Five Guys signature. The combination sounds absurd but the logic is simple: salt + sweet + fat + protein. The bacon’s crunch and smokiness cut through the rich peanut butter. Total calories: approximately 1,060 cal. Order it or skip it — there’s no middle ground.

Oreo Cookies + Salted Caramel — The sweet-salty classic. The cookies add crunch and chocolate flavor; the caramel adds richness and a warm, slightly bitter note. More approachable than PB + Bacon.

Banana + Peanut Butter — Essentially a peanut butter banana shake. Rich and filling. The banana softens the peanut butter’s intensity and adds natural sweetness that reduces the need for extra sweetener.

Coffee + Chocolate — A mocha milkshake. The coffee bitterness balances the chocolate sweetness; the vanilla base keeps it from being too intense. The closest thing to a dessert-coffee drink on the menu.

REESE’S Cups + Peanut Butter — Maximum peanut butter. For people who want the full REESE’S experience in liquid form. Very sweet, very rich.

Strawberries + Bananas — The lightest combination. A fruit-forward shake with the lowest calorie mix-in pair (90 + 160 = 250 cal addition). The vanilla base anchors the fruit without getting in the way.

The most common mistake with homemade milkshakes is over-blending. This isn’t about flavor — it’s about what blending does to the texture.

When you blend ice cream, you’re breaking down its frozen structure and incorporating air. Short blending = minimal air = thick, dense result. Long blending = significant air incorporation = thinner, frothier, more liquid result. The sweet spot for a Five Guys-style shake is 15–20 seconds on the lowest speed your blender offers.

The signs you’ve hit the target: the blender paddle creates a slow, uniform swirl rather than a fast vortex; the shake barely pours from the blender; a spoon drawn through it leaves a defined channel for 2–3 seconds before filling in.

The sign you’ve gone too far: it pours like milk; foam appears on top; the shake is drinkable through a regular-width straw.

There’s no recovering from over-blending. You can add more ice cream and blend briefly, but that often leads to another over-blend cycle. Better to err on the side of under-blending and stir the last few unmixed bits in manually.

The shake is almost entirely ice cream, so ice cream quality determines the result. What matters:

Fat content. Premium ice cream (Häagen-Dazs, Jeni’s, Ben & Jerry’s) has more cream fat and less added air than economy brands. More fat = richer flavor and a creamier texture that holds up to blending. Economy brands have more air whipped in (less weight per volume), which blends into foam faster and produces a thinner shake.

Ingredients. The shorter the ingredient list, the better for this application. Vanilla ice cream that contains cream, skim milk, sugar, egg yolks, and vanilla extract is going to produce a shake that tastes like dairy. Ice cream with cellulose gum, carrageenan, and “natural flavor” produces a shake that tastes like processed dairy. Both work; the premium option is noticeably better.

Vanilla quality. Vanilla bean ice cream (with visible specks) has a more complex vanilla flavor than vanilla-flavored ice cream. For a plain vanilla shake with no mix-ins, this matters. For a PB + Bacon shake, it’s largely irrelevant — the mix-ins overwhelm the vanilla anyway.

Vanilla base: 670 cal, 32g fat, 84g carbs, 13g protein, one shake (396g)

With Peanut Butter + Bacon: ~1,062 cal — the full Five Guys experience

At home cost comparison (PB + Bacon shake):

• 2 cups good supermarket vanilla, e.g. a 48-oz tub at $5 ($1.50 for 2 cups)
• 3 tbsp whole milk (~$0.05)
• 2 tbsp peanut butter (~$0.15)
• 2 strips bacon (~$0.80)

Total: ~$2.50 vs. $5.69–$7.49 at Five Guys — roughly $3–5 saved per shake, with any combination of the 11 mix-ins and no upcharges. Stepping up to a premium pint (Häagen-Dazs or Jeni’s runs ~$5–6 for the ~2 cups you need) pushes the home cost closer to $6, still competitive once you stack mix-ins.

If you’re making the milkshake alongside a Five Guys order, the Copycat Five Guys Bacon Cheeseburger covers the smash patty technique and the free-toppings bar. The Copycat Five Guys Cajun Fries handles the peanut oil fry and the Cajun spice blend — the fries that require their own separate bag because they overflow the main bag. And the Five Guys Grilled Cheese is what vegetarians order with their fries.

For milkshake comparisons: the Copycat Dairy Queen Blizzard covers the thicker, spoonable frozen dessert territory (stand mixer + fold-in technique, passes the flip test), and the Copycat In-N-Out Neapolitan Shake covers the layered three-flavor shake that the West Coast chain serves.