Par cook your lasagna noodles just a few minutes shy of the required cooking time on the box. Ensure your noodles are in salted water and stir every minute to ensure they do not stick.
If Italian sausage has not been cooked yet, saute until browned and broken into smaller pieces. Remove from any casing if required.
While noodles are cooking, make your ricotta mixture by mixing together ricotta, egg, and Italian seasoning.
Mix your mozzarella, monterey jack, and parmesan cheeses together.
Now that your ingredients are prepped, it is time to assemble!
At the bottom on the dish, add about 1 cup of sauce and spread.
Next, layer 3 cooked lasagna, 1 cup of sauce, and half of ricotta cheese mixture. Sprinkle about 1 cup of cheese and half of the sausage.
Repeat another layer of pasta, sauce, ricotta cheese, cheese mix, and sausage. You will have used up all of the ricotta cheese and sausage mix.
On the last layer, place your last 3 lasagna noodles on top of the mix, spread the remaining sauce and layer the top with remaining cheese.
Bake at 350F for about 45 minutes until the top is golden brown and bubbly. If You may need to place a sheet tray under your baking dish in case any cheese bubbles over.
Let cool about 10 minutes before serving. Enjoy!