Prepare
Preheat the oven to 400°F. Lightly grease a 9 by 13-inch baking dish.
About 5 min
Make the sauce
Brown the Italian sausage in a large skillet over medium heat, breaking it into crumbles as it cooks. Drain any excess grease.
About 8 minStir in all of the tomato sauce and the Italian seasoning. Taste and add more seasoning if needed. Let the sauce warm through for a few minutes.
About 5 min
Layer
Spread a thin layer of meat sauce over the bottom of the prepared dish. Arrange a single layer of oven-ready noodles over the sauce, making sure the noodles are fully covered underneath.
Cover the noodles with meat sauce, then add pepperoni, mozzarella, and cheddar. Repeat until you have 3 noodle layers, finishing with sauce and both cheeses on top.
About 7 min
Bake
Cover the dish tightly with aluminum foil and bake for 30 minutes.
About 30 minRemove the foil and bake for about 10 more minutes, until the cheese is bubbling and the noodles are tender when pierced with a knife.
About 10 min
Rest
Let the lasagna rest for 10 to 15 minutes before cutting and serving.
About 10 min

