Ingredients

• 1 lb ground beef
• 1 med onion, chopped
• 1 clove garlic, minced, or more to taste
• 1 (10 oz) can sliced mushrooms, drained
• 1 tsp dried oregano
• 2 dashes hot pepper sauce, or more to taste
• salt and ground black pepper to taste
• 2 (10 oz) pkgs frozen chopped spinach, thawed and drained
• 1 (10.5 oz) can condensed cream of celery soup
• 1 cup sour cream
• 1 (8 oz) pkg shredded mozzarella cheese

Directions

1. Preheat the oven to 350 degrees.
2. Heat a large skillet over medium-high heat. Add ground beef, onion, and garlic; cook and stir in the hot skillet until beef is browned and crumbly, 5 to 7 minutes. Drain and discard grease. Add mushrooms, oregano, hot sauce, salt, and pepper; simmer for 5 minutes.
3. Add spinach, condensed soup, and sour cream; cook until heated through, about 5 minutes. Transfer mixture to a casserole dish and cover with mozzarella cheese.
4. Bake in the preheated oven until cheese is melted, 15 to 20 minutes.