Cook chicken breasts in a pot with just enough water to cover them (about
1 hour). Remove chicken and let cool. Cook broccoli in a small amount of water for 5-10 min. Drain. Layer broccoli on bottom of greased glass baking dish. Cut chicken into cubes and layer over broccoli. Combine cream of
chicken soup, lemon juice and mayonnaise. Spread soup mixture evenly over chicken and broccoli. Cover with grated cheese. Top with breadcrumbs and drizzle melted butter over all. Bake at 350°F until casserole is bubbly (about 40-45 min.).