Avocado Beef Burgers

Name: Avocado Beef Burgers
Prep time: 15 min
Cook time: 20 min
Total time: 35 min
Cuisine: American
Ingredients: 1 lb ground beef; 1 large avocado; 1 tablespoon green chili pepper, diced; 1 egg, slightly beaten; 1/4 cup green onion, chopped; 1 teaspoon fresh lemon juice; 1 teaspoon minced garlic; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 4 slices monterey jack cheese; hamburger bun with sesame seeds; 4 -6 teaspoons butter, melted; tomatoes; lettuce (optional); onion (optional); mayonnaise