Prepare the Easy Oven Roasted Ratatouille with Herbes de Provence. See the ingredient notes for more information.
Preheat the oven to 350 degrees F.
Add 6 lasagna noodles to boiling water with 1 tbsp of salt and 1 tbsp of olive oil. Boil noodles for 10 minutes and drain. Rinse the noodles, shake off the water, and set aside in a medium bowl.
Pour about 1/4 cup sauce evenly over the bottom of the baking dish.
Lay 3 pasta noodles side-by-side in a single layer over the sauce. You can leave the overhanging edges to get crispy or trim them.
Spoon several tablespoons (about 6 tbsp) evenly over each noodle.
Add 1/2 of the ratatouille mixture over the sauce.
Spread a thin layer of sauce over the vegetables.
Sprinkle 1/2 cup shredded Parmesan over the ratatouille.
Cut 1 cup mozzarella cheese (1/2 of the package) into 1/4 to 1/2 inch thick slices and tear them into smaller pieces.
Lay the pieces of mozzarella cheese evenly over the Parmesan.
Cut and tear the remaining mozzarella cheese.
Create the final layer the same way, layering noodles, sauce, ratatouille, sauce, Parmesan, mozzarella.
Cover the pan with aluminum foil.
Place the pan on a rimmed baking sheet and bake covered for 20 minutes
Uncover and let the top layer of cheese melt, about 10 minutes.
Let the lasagna for 5 minutes before slicing to prevent it falling apart.