Heat a large sauté pan over medium heat.
Add Italian sausage, ground beef, and Italian seasoning. Cook until browned.
Remove from heat, drain, and set aside.
If using dried pasta sheets, cook as per package instructions. Drain and set aside.
Spread 1/2 cup of marinara sauce on the bottom of an 8-quart baking pan.
Place a pasta sheet over the sauce.
Evenly distribute 3 cups of lasagna filling over the pasta.
Spread 3/4 cup of cooked meat evenly over the filling.
Add 1/4 cup of marinara sauce evenly over the meat.
Sprinkle 1/4 cup of Parmesan cheese on top.
Place another pasta sheet on top.
Repeat for a total of 6 pasta layers and 5 filling layers.
Spread 1/4 cup of marinara on top.
If preparing in advance, cover with 2 layers of plastic wrap and 2 layers of foil. Refrigerate for up to a day.
Preheat the oven to 350°F.
Remove plastic wrap and foil, if used.
Place lasagna in the oven and bake for about 2 1/2 hours, or until an instant-read thermometer reads 155°F.
Remove from the oven and sprinkle grated Provolone on top to melt.
Allow the lasagna to rest for 15 minutes.
Cut into portions and serve with extra marinara and grated Parmesan.