Heat a large skillet over medium-high heat. Add the ground beef and cook, breaking it up as it browns. Drain any excess grease.
1 pound ground beef, turkey, or Italian sausage
Toss in the onions and bell peppers, and saute with the beef. Cook until softened and fragrant, about 3–4 minutes.
½ cup diced onions, ½ cup diced green bell peppers
Add the garlic, Italian seasoning, sugar or sweetener (to balance acidity), and salt and pepper to taste. Stir to combine.
3-4 garlic cloves Minced, 1-2 teaspoons Italian Seasoning, salt and pepper to taste, 2 tablespoons sugar or sweetener
Add marinara sauce and stir. Add 1 cup of water to the marinara sauce bottle and shake the bottle to get as much out as you can. Add the watery mixture to the pan. Stir to combine and remove the pan from heat. Taste repeatedly and add additional spices/salt if needed.
24 oz marinara sauce, 1 cup water
I use a 7 Quart Slow Cooker: Add a layer of meat sauce to the slow cooker, followed by lasagna noodles. You will have to break up some of the noodles to get them to fit. Then add some of the ricotta, Parmesan, and mozzarella cheese. Repeat the layers. You want to end with meat sauce topped with mozzarella cheese. I like to season each layer, so I add a little salt and pepper for each layer because once the pasta is added, the starch from the lasagna noodles will impact the flavor and I want to avoid bland lasagna. This is optional. 1 ½ cups ricotta cheese, 1 cup grated Parmesan reggiano cheese, 2 cups grated mozzarella cheese, 12-16 ounces lasagna noodles
Completely cover the final layer of noodles with the remaining meat sauce. Make sure there aren't any exposed pieces of pasta, or they can turn dry and hard. Sprinkle cheese over the top. Feel free to add more cheese than the recipe calls for.
Cook on Low 3 to 4½ hours, or until the noodles are tender and the cheese is melted. Start checking the lasagna around the 2-hour mark because slow cookers vary. You don't want the edges of the lasagna to burn. Mine is always ready in under 3 hours.This is important. Do not set it and forget it, if it's your first time making the dish. Every slow cooker cooks at varying speeds and some run hotter than others. If you leave the dish unattended for multiple hours, the sides may burn. Turn off the Crockpot and let the lasagna rest uncovered for 20 to 30 minutes before slicing. This gives the layers time to set and makes it much easier to serve.