This Walmart-inspired sheet cake bakes in one pan, slices cleanly, and stays soft & moist for days thanks to Greek yogurt and egg whites.
The flavor is classic party cake — fluffy vanilla base with a sweet white frosting — but with less sugar and added protein so you can enjoy a slice without the crash.
Using protein powder + oat flour helps make each slice more filling, which is ideal when you’re surrounded by rich store-bought desserts.
Great for birthdays, office parties, or weekly meal-prep treats — it tastes like a celebration cake but fits a lighter lifestyle. 🎂
Nutritional values are estimates and may vary based on brands or quantities. For medical or dietary concerns, consult a qualified health professional.
🥗 Ingredients for Healthy Walmart-Style Birthday Cake (12 Slices)
| Ingredient | Quantity | Calories |
|---|---|---|
| Nonfat Greek Yogurt | 1 cup | 140 kcal |
| Egg Whites | 4 large | ≈ 68 kcal |
| Whole Egg | 1 large | 70 kcal |
| Vanilla Protein Powder | 1/2 cup (≈ 60 g) | 240 kcal |
| Oat Flour (or finely blended oats) | 1½ cups | ≈ 510 kcal |
| Baking Powder | 2½ tsp | 0 kcal |
| Unsweetened Almond Milk (or low-fat milk) | ¾ cup | ≈ 30 kcal |
| Granulated Zero-Calorie Sweetener (or sugar) | ⅔ cup | 0–520 kcal* |
| Vanilla Extract | 2 tsp | 0 kcal |
| Pinch of Salt | 1 pinch | 0 kcal |
| Light Cream Cheese (softened) | 4 oz (≈ 115 g) | ≈ 280 kcal |
| Nonfat Greek Yogurt (for frosting) | ½ cup | 70 kcal |
| Powdered Sweetener (or powdered sugar) | ½ cup | 0–400 kcal* |
| Vanilla Extract (for frosting) | 1 tsp | 0 kcal |
| Rainbow Sprinkles (optional) | 2 tbsp | ≈ 60 kcal |
➡️ Calories per slice (12 slices): ≈ 120 kcal
➡️ Protein per slice: ≈ 9 g
✅ Benefits of Each Ingredient
👩🍳 Preparation Steps
- Preheat: Heat oven to 350°F (175°C). Lightly grease or line a 9×13-inch baking pan with parchment.
- Mix wet ingredients: In a large bowl, whisk Greek yogurt, egg whites, whole egg, almond milk, vanilla, and granulated sweetener until smooth.
- Mix dry ingredients: In another bowl, stir together oat flour, protein powder, baking powder, and salt.
- Combine: Add dry ingredients to wet and mix gently until just combined. Do not overmix — a few small lumps are okay.
- Bake: Pour batter into the pan, smooth the top, and bake 22–28 minutes or until a toothpick comes out mostly clean.
- Cool completely: Let the cake cool in the pan, then chill slightly in the fridge for easier frosting.
- Make the frosting: Beat light cream cheese until smooth, then mix in Greek yogurt, powdered sweetener, and vanilla until thick and creamy.
- Frost & decorate: Spread frosting over the cooled cake in an even layer. Add sprinkles on top for that Walmart-style birthday look.
- Slice & serve: Cut into 12 squares and enjoy immediately, or chill for cleaner slices.
Tips
- Use room-temperature ingredients so the batter mixes smoothly and bakes evenly.
- Don’t overbake: Take the cake out as soon as the center sets — this keeps it soft and moist.
- Chill before slicing: A short chill in the fridge helps the frosting firm up for clean cuts.
- Adjust sweetness: Taste the frosting and add more sweetener if you prefer a “store-cake” level of sweetness.
- Storage: Keep leftovers in an airtight container in the fridge for up to 4 days, or freeze slices for up to 1 month.
🍽 Nutritional Facts (Per 1 Slice)
| Nutrient | Amount |
|---|---|
| Calories | ≈ 120 kcal |
| Protein | ≈ 9 g |
| Fat | ≈ 3 g |
| Carbs | ≈ 15 g |
| Fiber | ≈ 2 g |
🌿 Key Benefits
❓ FAQ
Can I make this without protein powder?
Yes. Replace the protein powder with more oat flour (about ½ cup), but protein will be lower and texture slightly denser.
What if I only have regular sugar?
You can use it, but calories per slice will increase. Start with the same amount and adjust to taste.
Can I bake this in a round pan?
Yes. Use two 8-inch round pans and reduce baking time slightly, checking for doneness early.
Can I make a chocolate version?
Swap ¼ cup of oat flour for unsweetened cocoa powder and use chocolate protein powder instead of vanilla.
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