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A plate of spinach lasagna with salad.

Slow Cooker Spinach Lasagna

  • Prep Time: 30 minutes
  • Cook Time: 5 hours
  • Total Time: 5 hours 30 minutes


  • 1 (14.5-ounce) can Diced Tomatoes with Basil, Garlic, and Oregano, drained
  • 1 (26-ounce) jar marinara sauce
  • 1 (6-ounce) can tomato paste
  • 1 teaspoon olive oil
  • 1/2 cup chopped sweet onions, like Vidalia
  • 8 ounces button or baby portobello mushrooms, sliced
  • 2 teaspoons minced garlic
  • 1 (16-ounce) bag frozen chopped spinach, slightly thawed
  • 1 (16-ounce) container smooth and creamy cottage cheese
  • 1 (8-ounce) package shredded mozzarella cheese
  • 1 large egg, beaten
  • 1/2 teaspoon salt
  • 1/4 teaspoon pepper
  • 1 (8-ounce) package no-cook flat (not curly edged) lasagna noodles
  • 1/2 cup grated Parmesan cheese


  1. In a large bowl, mix together diced tomatoes, marinara sauce, and tomato paste. Set aside.
  2. Heat oil in a large nonstick skillet over medium heat. Add onions, mushrooms, and garlic and sauté, stirring frequently, for 3 minutes. Add spinach and sauté, stirring frequently, until the liquid has cooked off, about 3 minutes more. Remove from heat and place spinach mixture in a large bowl. Add cottage cheese, shredded mozzarella, egg, salt, and pepper, and stir to mix thoroughly.
  3. Spread 1 cup tomato mixture on the bottom of a slow cooker. Top with a complete covering of lasagna noodles. (Break noodles to fit all spaces, overlapping if necessary.) Spread 3/4 cup of sauce over noodles. Top with 1/2 of the spinach mixture, spreading it evenly with the back of a spoon. Place another layer of lasagna noodles over spinach mixture. Spread 3/4 cup of sauce atop noodles, then spread remaining spinach mixture over sauce. Add a final layer of noodles and top with remaining tomato sauce. Sprinkle Parmesan cheese over sauce.
  4. Cook on low for 5 hours, until the noodles are tender and lasagna holds together when tested with a knife.
  5. Tip: When assembling this incredibly easy lasagna, remember this little refrain: Sauce, noodles, sauce, spinach, noodles, sauce, spinach, noodles, sauce. Leftover lasagna freezes well. Thaw and reheat in the microwave before serving.


  • Serving Size: 8-10
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