Summer Squash Stir-Fry

Ingredients (8)

• 1 small zucchini or yellow summer squash, cut int 1/4-inch slices
• 1 small green pepper, julienned
• 1 small onion, chopped
• 1 tablespoon butter
• 1 medium tomato, peeled and chopped
• 1/2 cup cubed fully cooked ham, optional
• Salt and pepper to taste
• 1/2 cup shredded cheddar cheese, optional