Gather your ingredients and organize your prep and cooking space.
Pre-heat oven to 350°
On the stove top, heat Molly's Marinara Sauce over low heat until hot, but not boiling.
Julienne the basil and set aside.
Slice each chicken breast in half length-wise and pound until the thickness of each is uniform.
Put the egg into a bowl, ADD the water, and beat to combine.
Put the breadcrumbs in a bowl.
Add the olive oil to the pan and heat over a medium setting/flame until it begins to shimmer.
Using tongs or a fork, pick up a chicken breast and place in the bowl of egg wash. Alternating sides, swirl and move the meat in the bowl to thoroughly cover the meat. Lift and let excess egg wash drip back into the bowl.
Place the meat into the bowl of breadcrumbs. Alternating sides, swirl and move the meat in the bowl until thoroughly coated.
Place into the frying pan and cook for approximately 1 minute or until the breadcrumbs are light brown in color. Flip the meat and cook for another minute being careful not to allow the breadcrumbs to burn. Move meat to the casserole dish. Repeat with the remaining breasts.
Add Molly's Marinara Sauce to the casserole dish using enough to cover the meat. Add the parmesan and basil and finish with the mozzarella.
Place in the oven and bake for approximately 20 minutes until the sauce is bubbling and the mozzarella has melted but not browned. Remove from the oven, garnish with basil and serve.
Optional additional cooking: If you like a brown, crispy topping, place the casserole under the broiler. Be careful not to burn the cheese.