Cinnamon Roll Protein Bars

Ingredients

• buttery cooking spray (We used avocado oil spray.)
• 1 box (16 oz.) sugar free yellow cake mix (We used Pillsbury Moist Supreme Sugar Free Classic Yellow Cake Mix.)
• 2 scoops (2/3 cup) protein powder (We used RYSE Jet-Puffed Loaded Protein Marshmallow Flavor.)
• 1/2 cup Splenda
• 1 tsp. baking soda
• 1 Tbsp. cinnamon, ground
• 1/4 cup Splenda brown sugar blend
• 2 Tbsp. vegetable oil
• 5 large egg whites
• 1 large whole egg
• 1/3 cup fat free milk