Pepperoni Pizza-Inspired Lasagna

Preheat oven to 350°F (175°C).

In a medium bowl, mix the beaten egg, ricotta cheese, and Parmesan cheese until well combined. Then, stir in 1 cup of the mozzarella cheese.

Set aside 9 pepperoni slices and 2 tablespoons each of chopped green bell pepper and red onion for later use.

Quarter the remaining pepperoni slices and place them in a separate medium bowl. Add marinara sauce, water, the remaining green bell pepper, and the remaining red onion. Mix well.

Lightly coat the bottom of an 8-inch square baking dish with cooking spray. Spread 1/2 cup of the sauce mixture evenly over the bottom of the dish.

Layer 2 lasagna noodles, broken to fit, over the sauce, followed by 1/3 of the ricotta mixture, and then another 1/2 cup of the sauce mixture. Repeat this layering process twice.

For the final layer, place the remaining lasagna noodles on top, followed by the remaining sauce mixture, the remaining 1/2 cup of mozzarella cheese, and the reserved pepperoni slices, green bell pepper, and red onion.

Cover the dish with aluminum foil that has been lightly coated with cooking spray. Bake for 45 minutes, then uncover and bake for an additional 10 minutes, or until heated through and bubbly.

Remove the lasagna from the oven and let it stand for 10 minutes before cutting and serving.