Heat the oven to 350°F. Arrange 15 dried lasagna noodles in an even layer in a 9x13-inch baking dish. Add enough very hot tap water to completely cover the noodles. Let soak for 20 minutes, moving the noodles around occasionally and separating any stacked noodles. Meanwhile, prepare the remaining ingredients and filling.

Combine 8 ounces shredded sharp cheddar cheese and 8 ounces shredded Monterey Jack cheese in a medium bowl.

Heat 1 tablespoon vegetable oil in a large high-sided skillet or Dutch oven until shimmering. Add 1 diced large red onion and 1 diced large red bell pepper, and cook over medium heat until softened, about 5 minutes. Add 1 pound lean ground beef, 8 ounces raw mild italian sausage, 1 ½ teaspoons chili powder, ¾ teaspoon kosher salt, ½ teaspoon black pepper, and ½ teaspoon ground cumin. Cook, breaking up the meat with a wooden spoon into bite-sized pieces, until cooked through, about 8 minutes.

Stir in 1 (about 24-ounce) jar fire-roasted marinara sauce, 1 (14.5-ounce) can fire-roasted diced tomatoes and their juices, and 1 (7-ounce) can diced green chiles and their juices. Bring to a simmer. Turn off the heat.

Drain the lasagna noodles. Wipe the baking dish dry.

Evenly spread ¾ cup of the meat sauce in the baking dish. Arrange 5 of the lasagna noodles in an even layer on top of the sauce, breaking them as needed to fit (it’s OK if the noodles overlap slightly).

Dollop and spread half of the ricotta cheese (1 cup) over the noodles. Dollop and spread about 3 cups of the meat sauce over the ricotta cheese. Evenly sprinkle with 1 cup of the shredded cheeses.

Repeat layering lasagna noodles, ricotta cheese, meat sauce, and shredded cheese. Top with the remaining 5 lasagna noodles. Spread the remaining sauce evenly onto the noodles to completely cover. Sprinkle with the remaining shredded cheeses.

Bake uncovered until the noodles are tender, the cheeses are melted, and the sauce is bubbling, 30 to 40 minutes. Let cool for 20 minutes before serving. Garnish with chopped fresh cilantro leaves if desired.