2 Cups (160g) Rolled Oats
8 Tablespoons (56g) Coconut Flour
1/4 Cup Sweetener
1/2 Teaspoon Salt
3 Teaspoons Baking Powder
3 Scoops (90g) Vanilla Protein Powder
3 Large Egg Whites (138g Liquid)
1 1/2 Tablespoons (21g) Coconut Oil
1 Tablespoon (21g) Honey
1 Container (5.3 Ounces/150g) Fat Free Plain Greek Yogurt
1/2 Cup (4 Ounces) Sugar Free Vanilla Coconut Milk (or Regular Milk/Other Milk Substitute)
1 Teaspoon Vanilla Extract
2 Tablespoons (30g) Sugar Free Chocolate Chips (Optional)
Couple Teaspoons Rainbow Sprinkles (Optional)
Here is the Protein Frosting recipe:

4 Ounces (113g) Fat Free Cream Cheese
1 Container (5.3 Ounces/150g) Fat Free Vanilla Greek Yogurt
1/2 Teaspoon Vanilla Extract
1 Scoop (30g) Vanilla Protein Powder
1 Teaspoon Sweetener
Calories in the WHOLE Protein Frosting recipe:

Calories: 293
Fat: 1g
Saturated Fat: 0g
Sodium: 925mg
Carbs: 24g
Fiber: 0g
Sugar: 18g
Protein: 47g
Calories in the WHOLE Birthday Cake w/out Frosting:

Calories: 1620
Fat: 44g
Saturated Fat: 32g
Sodium: 869mg
Carbs: 170g
Fiber: 37g
Sugar: 39g
Protein: 136g
Calories in the WHOLE Birthday Cake w/ Frosting:

Calories: 1913
Fat: 45g
Saturated Fat: 32g
Sodium: 1794mg
Carbs: 194g
Fiber: 37g
Sugar: 58g
Protein: 183g

Turn your Rolled Oats into oat flour by blending or processing your oats until they look like flour. Add all of your dry ingredients (for your Birthday Cake) into a large bowl. Mix everything together. Take out another bowl for your wet ingredients and add all of those in. Mix your wet ingredient togethers. Slowly mix your wet ingredients into your dry ingredients. Add in your Chocolate Chips or whatever else you want to add in and mix them around a little bit. Take out a baking dish or pan and coat it with some non-stick cooking spray. Pour your mix in. Top it with some Rainbow Sprinkles. Bake on 350°F/176°C for 20:00-25:00. To make your Protein Frosting simply add all of your ingredients for it into a bowl and mix them together. Top your cake with the frosting and add some more Rainbow Sprinkles on top! Mouthgasm!

Tips:

To thicken up your Protein Frosting put it in the fridge for 20:00-30:00!
Add white chocolate chips, peanut butter chips, nuts, or anything else you can think of into or on top of your cake!