Add hot water to the stock pot to boil pasta. I typically fill my 6 qt stockpot halfway with water. Boil pasta until al dente.
In your skillet, add your diced onion, garlic, and ground beef. Add pepper, and cumin. Cook beef until browned. Onions will be translucent.
Drain grease into a tin can and set aside.
Add taco spice and 1/3 cup of water to the onions, garlic, and meat mixture, and stir to combine over medium-low heat.
Strain pasta, and return it to the stock pot.
Add the hamburger, onion, and garlic to the pan. Add drained Ro*Tel can to the pan, and the salsa. Mix thoroughly.
Add mixture to the casserole dish.
Sprinkle grated cheddar over the pasta and bake for 15 minutes at 350 degrees Fahrenheit.
Once casserole is baked and cheese is melted, add chopped tomatoes, olives, and greens to the top.
Serve casserole with sour cream or tortillas chips crumbled on top. *optional