Preheat your oven to 350°F (175°C) and gather your ingredients.

In a small bowl, mix taco seasoning ingredients or set aside pre-made seasoning.

Cook the ground beef or turkey in a skillet over medium heat for 5-6 minutes until browned, then drain excess fat.

Sauté chopped onion and jalapeno in oil in the skillet for 5-10 minutes until soft.

Stir in minced garlic and spinach, cooking for 2-3 minutes until spinach wilts.

Combine sautéed vegetables with cooked meat, fold in quinoa, seasoning, and half the cheese.

Transfer mixture to an 8x8-inch casserole dish, sprinkle with remaining cheese, and spread evenly.

Bake in the preheated oven for 20 minutes, or until cheese is melted and edges are golden brown.