Preheat your oven to 425°F and line a sheet pan with parchment paper.
In a bowl, combine the cauliflower rice, egg, garlic powder, onion powder, salt, and pepper. Mix well until the mixture binds together.
Press the cauliflower mixture evenly onto the sheet pan to form a thin, pizza-like crust.
Bake the crust in the preheated oven for 12-15 minutes until it starts to set and lightly brown.
While the crust bakes, season the chicken breast with salt and pepper, then grill or sear it in a pan until fully cooked. Once cooled, chop the chicken into bite-sized pieces.
Remove the crust from the oven and spread the buffalo sauce evenly over it.
Scatter the chopped chicken over the sauce, then sprinkle the light mozzarella cheese on top.
Return the sheet pan to the oven and bake for an additional 5-7 minutes until the cheese is melted and bubbly.
Remove from the oven, slice, and serve immediately for a delicious and protein-packed meal.