Ninja Slushi Wendy's Frosty

Craving that iconic Wendy’s Frosty at home? Now you can make it with just a few simple ingredients—no drive-thru needed! The Ninja Slushi Maker whips up the perfect creamy, chocolatey, and slightly malty Frosty texture that’s thick enough to scoop but smooth enough to sip.

With just a few ingredients and your Ninja Slushi, you’ll have a rich, velvety, and nostalgic treat in minutes. Grab a spoon (or fries for dipping!)

You will also love my Ninja Slushi Chick-fil-A Frosted Lemonade, Ninja Slushi Lemonade, Ninja Slushi Daiquiri, Ninja Slushi Margarita, Ninja Slushi Cherry Slush, Ninja Slushi Coffee Frappé (Vanilla Caramel). Ninja Slushi Strawberry Lemonade Slush, and Ninja Slushi Vanilla Protein Shake.

Key Ingredients

• Milk or Chocolate Milk – This is the base of the Frosty, giving it creaminess and a smooth, drinkable texture. Using chocolate milk enhances the cocoa flavor without needing extra chocolate syrup or cocoa powder. I never have chocolate milk at home, so I used regular milk and a couple of ingredients (noted below) to get chocolate flavor.
  • Whole milk is the best choice for a rich, creamy texture like the original.
  • 2%, skim milk, almond milk, and coconut milk will also work, but the Frosty will be thinner and less creamy.
• Chocolate Syrup – If using regular milk, chocolate syrup adds that classic chocolatey taste while also sweetening the mixture. It blends easily for a smooth consistency.
• Unsweetened Cocoa Powder – Cocoa powder provides a deep, rich chocolate flavor without extra sweetness.
• Sweetener or Sugar – Since Wendy’s Frosty has a lightly sweet taste, adding sugar or a sugar substitute ensures the perfect balance of sweetness without overpowering the chocolate. I use monkfruit sweetener because it's zero calorie.
• Whipped Cream or Cool Whip – This is the key to the Frosty’s signature texture! It adds lightness and fluffiness, making the mixture thicker and creamier, just like the original. Cool Whip is a great shortcut because it stabilizes the Frosty while giving it that iconic soft-serve consistency.

How it Tastes

The Wendy’s Chocolate Frosty has a creamy, smooth, and slightly airy texture, falling somewhere between soft-serve ice cream and a thick milkshake. It’s rich and chocolatey, but with a subtle malted flavor that gives it a distinct taste compared to regular chocolate shakes. It’s not overly sweet.

How to Make Wendy's Frosty in the Ninja Slushi Machine

Detailed measurements and full instructions can be found in the recipe card at the bottom of this post.

1. In a large mixing pitcher or bowl, whisk together the cocoa powder and granulated sugar to break up any clumps. Pour in the whole milk and chocolate syrup, then whisk until fully combined.
2. Gently fold in the whipped topping until the mixture is smooth and creamy.
3. Pour the Frosty mixture into your Ninja Slushi or preferred ice cream maker and process according to the machine’s instructions until thick and creamy. Press milkshake for the Ninja Slushi.
4. Allow the machine to process. Let the machine run for 15-45 minutes, depending on the sugar content and temperature of the liquid. Mine took 20 minutes.
5. Once the cycle is complete, place a cup under the self-serve spout and pull the handle to dispense the slushi.

Troubleshooting Tips if You Have Problems with the Machine

• Check the Liquid Ratio – If the mixture is too thick, the machine may struggle to process it. Try adding 1-2 tablespoons of additional liquid (sparkling water, juice, or even plain water) and restart the cycle.
• Make Sure the Mixture is Cold Enough – The machine works best when the liquid is super cold. If your base wasn’t chilled before adding it to the machine, try refrigerating or briefly freezing it before processing.
• Let It Process Fully – The Ninja Slushi Machine may take a few minutes to reach the right consistency. Be patient and let it complete the cycle. If needed, restart the process.
• Check for Ice Blockage – If the mixture is freezing unevenly, it may be too cold or concentrated in one area. Let it sit for a minute, give it a gentle stir, and try again.
• Ensure the Machine is Properly Assembled – Double-check that all parts (including the lid and paddle) are locked into place. If something is misaligned, the machine may not operate correctly.

Substitutions and Add-ins Ideas

• Honey
• Maple Syrup
• Espresso powder
• Peanut butter
• Crushed Oreos (Add to the finished Frosty.)
• Chocolate chips (Add to the finished Frosty.)
• Caramel drizzle
• Mint extract
• Protein powder
• A splash of brewed coffee
• Cinnamon or nutmeg

Frequently Asked Questions (FAQs)

How to Store

You can store leftovers in the machine, but you need to keep the machine running to maintain the frozen texture for up to 12 hours. If you turn it off, the Frosty will melt. You can also pour the milkshake into a freezer-safe container and freeze. When ready to enjoy, let it sit at room temperature for 10-15 minutes, then stir or blend again for a smooth consistency.