Chicken Casserole With Broccoli without flour

2 teaspoons olive oil 1 kg skinless chicken thigh , trimmed of fat and cut in half 1 large brown onion, finely sliced 2 stalks celery , chopped 2 teaspoons[...]

2 teaspoons vegetable oil 2/3 cup onion , chopped 2 large garlic cloves , minced 1 lb boneless skinless chicken breast , cut into 1-inch pieces 2 (14 1/2[...]