- Heat olive oil in a skillet over medium-high heat. - 2 tbsp. olive oil 
- Cook the garlic and onion for 1 to 2 minutes. - 2 garlic cloves, 1 onion 
- Add the beef and cook until browned, about 4 to 5 minutes. - 1 lb. ground beef 
- Add in the diced tomatoes, bell pepper, oregano, basil, parsley, and tomato paste. - 1 bell pepper, 2 cups tomatoes, 2 tsp. dried oregano, ¼ cup fresh basil, 1 tbsp. fresh parsley, 2 tbsp. tomato paste 
- Cook everything while stirring for 3 to 4 minutes. 
- Pour in the tomato sauce, stir everything, and season to taste with salt and pepper to complete the lasagna sauce. - 4 cups tomato sauce, Sea salt and freshly ground black pepper 
- Alternate layers of zucchini and eggplant topped with lasagna sauce in a slow cooker. - 2 medium zucchini, 1 medium eggplant 
- Finish with one last layer of lasagna sauce, top with fresh basil, cover, and cook on low for 4 to 6 hours.