No Bake Peanut Butter Chocolate Protein Bars

I found this online - I suspect from Shape.com, but I can't seem to find it upon looking again.

• Ready In: 15 mins
• Serves: 9
• Yields: 9 bars

Ingredients

• 1  cup  dry oats
• 1⁄4 cup  unsweetened cocoa powder
• 6  scoops  chocolate whey protein powder
• 1  teaspoon stevia
• 5  tablespoons  natural-style peanut butter
• 1  cup  fat free Greek yogurt
• 1  teaspoon vanilla
• 4  tablespoons water

Directions

1. Spray baking disk with non-stick cooking spray.
2. Mix all dry ingredients together.
3. Add all other ingredients, except water into dry mixture and stir till mixture becomes a dough consistency.
4. Slowly add water as needed until dough is easy to spread (Amount will vary based on the type of protein used).
5. Spread dough evenly into baking dish and refrigerate for several hours.
6. Cut into 9 squares and bag individually, storing in freezer or refrigerator until ready to eat.