Grain-Free Taco Casserole

Name: Grain-Free Taco Casserole
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American, Mexican, Latin American, TexMex
Ingredients: 1 small spaghetti squash; 1/2 pound ground beef; 1/2 T chili powder; 1 t cumin; 1/2 t garlic powder; 1/2 t onion powder; 1/4 cup chopped red onion; 1/2 cup sliced black olives; 1 cup additive-free salsa; 2 medium tomatoes, diced; 1 cup (heaping) shredded lettuce; guacamole, optional