It couldn't be easier:
1 bag frozen hash brown "crowns"
2lbs ground beef
2 packets taco seasoning
1 can diced tomatoes
1 can sliced black olives (optional)
1 sm can diced green chilies (optional)
1 bag (2C) shredded Mexican cheese
Green Onions (chopped)
Using large, rimmed baking sheet, cook crowns per package directions in a single layer. As crowns are cooking, brown ground beef, drain and prepare per taco seasoning packet directions. Open cans of vegetables and drain. (For tomatoes you may want to strain/rinse them to get extra liquid out).
Remove crowns from oven but leave on baking sheet. Take seasoned beef and distribute over the crowns. Sprinkle entire sheet with olives, tomatoes, and chilies (or toppings you prefer). Cover entire meal with the bag of shredded cheese.
Put back in hot oven for about 10 mins or until cheese is melted and bubbly.
Remove, cut into sections and plate. Cover with lettuce, and top with sour cream and onions. Enjoy!