Macaroni with Ham and Cheese Deluxe

INGREDIENTS

• 1 (16 ounce) package elbow macaroni
• 1/4 cup butter
• 1 onion, chopped
• 1 teaspoon minced garlic
• 1 green bell pepper, chopped
• 4 cups cubed, fully cooked ham
• 4 ounces shredded Monterey Jack cheese
• 4 ounces shredded hot pepper Monterey Jack cheese
• 2 ounces shredded sharp white Cheddar cheese
• 3/4 cup milk, or more as needed
• 4 Italian plum tomatoes, cut into wedges
• 6 ounces shredded sharp white Cheddar cheese