Ground Beef Spinach Casserole

This is a great ground beef and spinach casserole. Even my husband, who doesn’t care for spinach, likes this one! And it got rave reviews when I took it to a church potluck.

Ingredients
1 pound ground beef

1 medium onion, chopped

1 clove garlic, minced, or more to taste

1 (10 ounce) can sliced mushrooms, drained

1 teaspoon dried oregano

2 dashes hot pepper sauce, or more to taste

salt and ground black pepper to taste

2 (10 ounce) packages frozen chopped spinach, thawed and drained

1 (10.5 ounce) can condensed cream of celery soup

1 cup sour ...