If you haven't thawed your frozen cauliflower rice, place it in the microwave for 4-5 minutes. Remove from microwave and bag to cool briefly.

Mix protein powder, seasoning, and breadcrumbs in a large bowl.

Add cooled cauliflower to protein/breadcrumb mixture, stirring until completely mixed. Don't over stir or you'll end up with an oatmeal-like mixture.

Heat griddle or large skillets over low-medium heat and spray with nonstick cooking spray.

Add roughly 2 tablespoons of the cauliflower mixture in small circles. Using the backside of a spoon or spatula, flatten slightly to desired thickness. 

Allow the buns to brown on the bottom, similar to a pancake — likely 2-3 minutes per side.