Preheat oven to 350ºF. Lightly spray mini foil lasagna pans and set aside.
Heat 1 tbsp olive oil in a large skillet over medium high heat.
Add onion, green bell pepper, and mushrooms. Saute until vegetables are soft, approximately 5-7 minutes.
Add garlic and spinach to skillet. Saute for an additional 1-3 minutes, or until spinach is wilted. If excess water is released from the veggies, drain. Remove veggies from skillet and set aside on a plate.
Add ground beef to the skillet and brown, breaking apart into small pieces while it is cooking. If excess fat is released from the meat, drain.
Add veggies back into skillet. Stir to combine veggies and ground meat.
Add spaghetti sauce, salt, black pepper, and parsley to the skillet. Stir to combine. Turn off heat and set aside.
In a medium-sized bowl, combine cottage cheese, ricotta cheese, parmesan cheese, and egg.
Time to assemble the mini lasagnas! Spread a layer of meat sauce in the bottom of the mini foil pans.
Layer uncooked noodles, cottage cheese mixture, and meat mixture as desired, ending with meat mixture.
Sprinkle the top with shredded mozzarella cheese.
Place mini pans on a large sheet pan and bake, uncovered, in preheated oven for 30-35 minutes, or until bubbly and the cheese is somewhat crispy.
If you are eating them immediately, cover with foil and continue baking for an additional 20-25 minutes. Serve warm.
If freezing for later, let the lasagna fully cool. Cover and place in the freezer for up to 6 months.
To reheat frozen lasagnas, bake them at 350 degrees for 1 hour (uncovered). If you prefer to reheat in the microwave, remove from the foil pans, place on a microwave-safe dish, and microwave on high for 8-10 minutes. Enjoy!