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Preheat oven to 350°F. Lightly grease an 11" x 9" glass baking dish.
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Boil the lasagna noodles according to the directions on the box. Drain pasta and rinse with hot water. Drain again.
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In a large cast iron skillet over medium heat, sauté the Italian sausage, onion, and garlic on in 10-inch skillet for 8-12 minutes, until the sausage is cooked through.
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Drain the fat.
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Stir in the spinach, basil leaves, oregano, Kosher salt, and black pepper. Cook 2-3 minutes, until spinach is wilted.
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Stir in 1 cup of the pasta sauce and bring to a simmer. Turn off the heat and cool for 10-15 minutes.
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Stir in 1 cup of the mozzarella cheese.
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In the baking dish, spread a few spoonfuls of the pasta sauce across the bottom of the pan.
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Working with each noodle individually on a cutting board, spread 2 Tablespoons of ricotta cheese to within 1 inch of the short end. Top with 1/2 cup of Italian sausage mixture. Roll the noodle up firmly toward the unfilled end. Place seam side down in the baking dish. Repeat with the other 7 noodles. When finished, spread the remaining 1 cup of pasta sauce over the top.
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Cover the baking dish tightly with tin foil. Bake 35-45 minutes, until hot and bubbly. Remove the tin foil and sprinkle remaining 1 cup mozzarella cheese over top. Bake, uncovered, for about 4-5 minutes until cheese is melted.
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Remove from oven and let it stand 5-8 minutes before serving.
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To freeze the leftovers, allow lasagna rolls to cool completely. Place in an oven-proof and freezer-proof container and seal tightly. Freezes for up to 3 months. To reheat, let the container rest on the counter for 15 minutes before placing it in a 350 degree oven, uncovered, for about 30 minutes. I suggest you heat up some pasta sauce in a saucepan to serve alongside, in case the noodles have dried out.