Cowboy Casserole

Name: Cowboy Casserole
Prep time: 20 min
Total time: 20 min
Cuisine: American
Ingredients: 1 (32-oz.) bag of tater tots; 4 strips of bacon (about 3 oz.); 1/2 yellow onion, chopped; 2 cloves garlic, chopped; 1 lb. ground sirloin; 1 (10.75-oz.) can cream of mushroom soup; 3/4 c. milk; 1/2 tsp. salt; 3/4 tsp. ground black pepper, divided; 3 c. baby spinach, roughly chopped; 1 c. frozen corn; 8 oz. shredded cheddar or colby jack cheese; 1/4 c. grated parmesan cheese; Chopped chives or scallions, for topping