Ninja Slushi Wendy’s Vanilla Frosty (Copycat)

This Ninja Slushi Wendy’s Vanilla Frosty is thick, creamy, and just barely spoonable — exactly like the drive-thru original, made with four pantry ingredients and no ice cream at all.

The chocolate Frosty gets all the attention, but the vanilla is the one my family fights over. It’s cleaner, sweeter, and it does that thing where the spoon stands up in it for about ten seconds before slowly tipping over. If you already make my Ninja Slushi Copycat Frosty, this is the same idea in a different flavor — and honestly, it’s the one I make more often.

The important thing to understand up front: a Frosty is not a slush. It is somewhere between a milkshake and soft serve, and getting that texture out of the Ninja Slushi comes down to using the right setting and the right amount of fat. More on both below.

Why This Recipe Works

• No ice cream needed. Nothing to scoop, nothing to soften, nothing to melt into a puddle.
• Four ingredients, all shelf-stable except the milk.
• Genuinely thick. Instant pudding mix is what gives you that dense, spoon-standing texture instead of a thin vanilla milkshake.
• Makes eight servings, which is enough for a full family dessert or a birthday party.
• The machine does all of it. Whisk, pour, walk away.

Ingredients

• Whole milk — 4 cups. Do not substitute skim or 1% here. Fat is what makes a Frosty creamy rather than icy, and low-fat milk will give you something closer to a frozen milk cube.
• Sweetened condensed milk — one 14 oz can. This does double duty: sweetness and, more importantly, sugar content that keeps the mixture from freezing into a solid block.
• Instant vanilla pudding mix — one 3.4 oz box. Instant, not cook-and-serve. This is the texture ingredient and the single biggest reason this recipe works.
• Vanilla extract — 1 tablespoon. The pudding mix carries some vanilla flavor, but not enough on its own. Use real extract if you have it.

Why the sugar and fat both matter

The Ninja Slushi doesn’t freeze things solid — it chills a liquid to the point of slush and keeps churning it there. Sugar lowers the freezing point, which is what keeps the mixture soft enough for the auger to turn. Fat is what makes it taste creamy instead of icy.

A Frosty needs both, which is why plain sweetened milk doesn’t work and why this recipe leans on condensed milk and whole milk together. If you cut the sugar or the fat significantly, you’ll either get a rock or a thin shake — and there isn’t much middle ground.

How to Make a Vanilla Frosty in the Ninja Slushi

Step One: In a large pitcher, whisk the whole milk and sweetened condensed milk together until fully combined.

Step Two: Add the instant pudding mix and the vanilla extract. Whisk hard for a full minute — instant pudding clumps easily, and any lumps that go in will still be lumps when it comes out. The mixture will thicken slightly as you whisk. That’s what you want.

Step Three: Pour into your Ninja Slushi, staying below the max fill line. This recipe makes about 52 ounces, which fits every model except the smallest 48-ounce version — if that’s yours, scale down to three-quarters of the recipe.

Step Four: Select the Milkshake setting, not Slush. Let it churn for 30 to 60 minutes depending on how cold your milk started. It will beep when it reaches consistency.

Step Five: Dispense into cups and serve immediately with a spoon. Straws are optional and, if I’m being honest, largely decorative.

Tips for the Best Frosty Texture

• Use Milkshake mode, not Slush. Slush mode will churn this too cold and too aggressively, and you’ll lose the dense soft-serve texture that makes it a Frosty.
• Start with cold milk straight from the fridge. Room-temperature dairy can add twenty minutes or more to the churn.
• Let the machine rest upright for two hours before its first run if it’s been moved or stored on its side. The compressor needs it, and skipping this step is the number one reason a batch won’t set.
• Whisk the pudding mix in thoroughly. Lumps do not dissolve in the machine.
• Chill your cups in the freezer for ten minutes if you can. A Frosty softens fast in a warm cup.
• Don’t add ice. There’s nowhere for it to go and it will only water down the flavor.
• For a thicker result, adjust the consistency dial on the side panel while it runs.

Storing Leftovers

The easiest option is to leave it in the machine — the Slushi will hold it at serving consistency for hours as long as it stays powered on.

If you want the machine back, transfer leftovers to an airtight container and freeze. It will firm up considerably, so let it sit on the counter for ten to fifteen minutes before scooping. It won’t be quite as smooth the second day, but it’s still very good, and it makes an excellent milkshake base if you blend it with a splash of milk.

Frequently Asked Questions

Can I use 2% or skim milk? You can, but I don’t recommend it. Fat is what makes a Frosty creamy, and lower-fat milk produces a noticeably icier result. If 2% is what you have, add a splash of heavy cream to make up the difference.

Can I make this dairy-free? Yes, with adjustments. Use full-fat oat or coconut milk plus a can of sweetened condensed coconut milk, and check that your pudding mix is dairy-free — many instant varieties contain milk derivatives.

Why is my Frosty icy instead of creamy? Almost always not enough fat, or you used the Slush setting instead of Milkshake. Check both.

Why won’t it thicken at all? Either too much liquid relative to the pudding mix, or the machine wasn’t given its two-hour upright rest. Also make sure you used instant pudding rather than the cook-and-serve kind.

Can I make the chocolate version instead? Yes — swap the vanilla pudding for chocolate and reduce the vanilla extract to a teaspoon. Or use my Ninja Slushi Copycat Frosty, which is written for chocolate specifically.

Can I add mix-ins? Not in the machine. Add crushed cookies, sprinkles, or a caramel drizzle to the cup after dispensing. Solid pieces will jam the auger.

What to Make Next

If you like how the Milkshake setting works, the Ninja Slushi Caramel Frappuccino uses the same mode and the same principles with coffee. The Ninja Slushi Frosted Lemonade is my other favorite drive-thru copycat, and the Ninja Slushi Root Beer Float Slush is the one my kids ask for most. You can find the rest in my drinks recipes.