1
Preheat oven to 375°F (190°C).
2
Cook lasagna noodles according to package instructions.
3
Brown ground beef in a skillet, then add onion and garlic.
4
Stir in marinara sauce and bring to a simmer.
5
In a separate saucepan, make bechamel sauce by melting butter, whisking in flour, and slowly adding milk.
6
Combine mozzarella and Parmesan cheese in a bowl.
7
Assemble lasagna by spreading a layer of meat sauce, then a layer of bechamel sauce, and finally a layer of cheese.
8
Repeat the layers two more times, ending with a layer of cheese on top.
9
Bake for 30-40 minutes, or until the cheese is melted and bubbly.
10
Let it rest for 10-15 minutes before slicing and serving.