Place a large skillet over medium-high heat.
Pat shrimp dry with paper towels.
Season shrimp with salt and black pepper.
Add 2 tablespoons butter to the skillet and allow it to melt.
Place shrimp into the skillet in a single layer.
Cook 2 to 3 minutes until shrimp begin to turn pink.
Flip shrimp and cook 1 to 2 more minutes until fully opaque.
Remove shrimp and set aside on a plate.
Keep the skillet over medium-high heat.
Add cauliflower rice.
Season cauliflower rice with salt.
Cook 5 to 7 minutes until lightly browned and moisture evaporates.
Reduce heat to medium-low.
Add 3 tablespoons butter and melt fully.
Add garlic and red pepper flakes and cook 20 to 30 seconds until fragrant.
Add shrimp back in.
Stir shrimp into the garlic-butter.
Add parmesan and stir to coat evenly.
Cook 1 minute to warm through.
Remove from heat and serve.