Deep Dish Taco Squares - I Ate The 80's

Ingredients

• ½ lb ground beef
• ½ cup sour cream
• ⅓ cup mayonnaise or salad dressing
• ½ cup shredded sharp Cheddar cheese (about 2 oz)
• 1 tbsp chopped onion
• 1 cup baking mix
• ¼ cup cold water
• 1 medium tomatoes, thinly sliced
• ½ cup chopped green pepper