Heat a dry skillet over medium-high heat. Add frozen cauliflower rice. Stir until moisture is removed and edges are crispy (5–7 minutes). Set aside.
In the same skillet, brown ground beef, breaking into crumbles (5–7 minutes).
Add the cooked cauliflower rice back to the skillet with the beef. Add salsa and diced tomatoes and cook over medium heat until liquid is reduced. Season with salt and pepper.
Oil a 9x13-inch casserole dish with cooking spray or drizzle olive oil and spread with a paper towel. Transfer skillet mixture to the dish. Allow to cool 5-10 minutes
Layer black olives over the top and spread sour cream over the olives.
Top with cheddar cheese.
Bake at 350°F for 20 minutes.
Turn oven to 425°F. Bake 5–10 minutes until cheese is golden and bubbly.
Remove from the oven. Cool 5-10 mutes to let it set and serve.
Video
Notes
Fully cook the cauliflower rice until the moisture is removed.
Drain excess fat from ground beef if needed
Ensure liquid is reduced from the beef mixture before transferring to the casserole dish.