Preheat oven to 350℉.
Line a baking tray with parchment paper and set aside.
In a small bowl, prepare your flax egg by combining ground flaxseeds with warm water. Set aside for 5 minutes.
To a medium-sized bowl, cream together softened vegan butter and sugars with a hand mixer.
Add in flax eggs, vanilla extract, salt, cornstarch, and Good Protein Cookies & Cream protein powder. Mix until well combined.
Add baking powder, baking soda, and all-purpose flour until a soft dough forms. Use a spatula to mix together.
Add crushed Oreos to cookie dough and fold in with a spatula.
Use a 3 tablespoon-sized cookie scooper to scoop cookie dough into balls and place on your prepared tray, patting the cookie down slightly. Place 2 inches apart.
Bake for 10-11 minutes or until edges become golden brown and slightly crispy.