Stuffed Chicken Breast with Spinach and Tomato Sauce

Name: Stuffed Chicken Breast with Spinach and Tomato Sauce
Ingredients: For the Chicken Breast; 6 chicken breasts, cut in half lengthwise; salt and black pepper; 1 cup flour, seasoned with salt and pepper; 2 eggs, lightly beaten; 1 cup breadcrumbs, seasoned with salt and pepper; 3 tablespoons vegetable oil, for frying; For the Spinach Filling; 1 10 oz package frozen spinach, thawed and squeezed dry; 1/2 minced onion; 2 cloves garlic, minced; 1 tablespoon olive oil; 1 tablespoon butter; 1 egg, lightly beaten; 1/3 cup breadcrumbs