Barbecue Beef Tater Tot Casserole

Name: Barbecue Beef Tater Tot Casserole
Prep time: 20 min
Cook time: 30 min
Total time: 50 min
Cuisine: American, Southern
Ingredients: 2 lb lean ground beef; 1 medium sweet onion (chopped); olive oil; 1 16 oz bottle barbecue sauce; 1 14 oz can Mexican corn with peppers (drained ); 1 10 oz can Rotel tomatoes with green chilies; 1 Tbsp barbecue seasoning; 1 tsp garlic salt; 1 tsp ground cumin; 1/2 tsp black pepper; 2 cup shredded sharp cheddar cheese; 1 30 oz bag crispy crowns or tater tots; 2 green onion thinly sliced