Preheat a large skillet over medium-high heat on the stove. Add the the yellow onions and sautee in avocado oil for 10-15 minutes until they start to brown. Add the ground lamb to the sauteeing onions, and cook until it is no longer pink. Set the lamb and onion mixture aside.
Preheat your oven to 350 degrees.
Cook the pasta according to package instructions. Drain the pasta and add it to the skillet with the lamb and onions. Next, add the baby spinach, marinara sauce, and havarti cheese and mix it all up until the cheese is mostly melted.
Transfer the mixture to a greased 9x13 baking dish. Sprinkle the top with the parmesan cheese. Bake on 350 degrees for about 20-30 minutes until it starts to brown and bubble. Enjoy!
The nutrition facts presented here are estimates only. The brands you use and product types chosen can change the nutritional information presented. To obtain the most accurate nutritional information, you should calculate the nutritional information with the actual ingredients you use.