Healthy Squash and Kale Casserole

Name: Healthy Squash and Kale Casserole
Ingredients: 2 tablespoons olive oil; 1/4 of a medium yellow onion, chopped; 6 cups finely chopped kale (about 5 ounces); 1 small garlic clove, minced; Kosher salt and freshly ground black pepper; 1/2 cup low-sodium chicken broth; 2 cups of 1/2-inch diced yellow squash (about 8 ounces); 2 cups of 1/2-inch diced zucchini (about 8 ounces); 2 tablespoons mayonnaise; 3 cups frozen brown rice, thawed; 1 cup grated Swiss; 1/3 cup grated Parmesan; 1 cup panko bread crumbs; 1 large egg, beaten; Cooking spray