California Chicken

Name: California Chicken
Prep time: 10 min
Cook time: 25 min
Total time: 35 min
Cuisine: American
Ingredients: 1 teaspoon olive oil; 4 skinless, boneless chicken breasts; 0.5 teaspoon onion powder; 1 pinch salt and ground black pepper to taste; 2 ripe tomatoes, sliced; 1 (8 ounce) package Monterey Jack cheese, cut into 10 slices; 2 avocados - peeled, pitted and sliced