Prepare the Noodles: Cook the lasagna noodles according to the package instructions, slightly undercooking them (about 1-2 minutes less). Drain and set aside.
- Prepare the Meat Sauce: In a large skillet, heat oil over medium heat. Add the diced onion and garlic, and sauté for 2-3 minutes. Add the ground meat, breaking it up with a spoon, and cook until browned. Stir in marinara sauce, basil, oregano, salt, and pepper. Simmer for 5-10 minutes. Set aside to cool slightly.
- Make the Ricotta Mixture: In a medium bowl, combine ricotta cheese, 1 cup mozzarella cheese, Parmesan cheese, and egg. Mix until smooth and well combined. Season with salt and pepper.
- Assemble the Mini Lasagne Cups: Preheat your oven to 375°F (190°C). Grease a 12-cup muffin tin. Cut cooked lasagna noodles into 1-inch strips. Place one strip in each muffin cup to form the first layer. Add a spoonful of meat sauce, followed by a dollop of ricotta mixture. Repeat the layers until the muffin cups are filled. Top with remaining mozzarella cheese.
- Bake the Mini Lasagne Cups: Bake for 18-20 minutes, or until the cheese is bubbly and the tops are golden brown. Let them cool for a few minutes before removing from the muffin tin.
- Serve: Garnish with fresh basil or parsley and serve warm.