Nachos

Ingredients

• 1 small Mexican Velveeta cheese, cubed
• 8 ounce Cheddar cheese, shredded
• 1/2 medium onion, chopped
• 1/2 green pepper, diced
• 2 stalks celery, diced
• 2 tablespoons butter
• 2 fresh tomatoes, diced
• 1 small can black olives, sliced
• 1 pound ground beef, lean
• 1/4 cup milk
• 1/4 cup sour cream
• 1/2 cup green onions, chopped
• tortilla chips