brown both meats in pan with 1/2 the garlic
add marinara sauce. stir and remove from pan. leave just enough in pan to cover the bottom.
in separate bowl, mix ricotta cheese, egg, remaining garlic, oregano and half mozzarella cheese.
place lasagna noodles across bottom of pan on top of sauce.
spread 1/2 of the ricotta mixture and 1/2 the baby spinach on top of noodles
place noodles in opposite direction of last noodle layer on top of spinach. The add 1/2 the meat sauce and a layer of mozzarella cheese.
another layer of noodles in the opposite direction again. The add remaining ricotta mixture and remaining spinach
another layer of noodles in the opposite direction of the last noodle layer. Then add remaining meat sauce on top of the noodles. Then add remaining cheese.
Bake in a 400F oven for 15 minutes. Reduce heat to 350F and bake for an additional 45 min to 1 hour until dish is heated through and bubbling.