Rinse quinoa well through a fine strainer. In a small pot, bring 1/2 cup water to boil and add quinoa. Cover and reduce heat to low. Simmer for about 15 minutes or until tender.
Meanwhile, preheat oven to 375.
In a medium-sized skillet over medium heat, add olive oil and heat for 2 minutes. Add garlic and onion and cook for 2 to 3 minutes until onion slightly translucent. Remove from heat.
In large bowl, add onion mixture, thawed ground beef/turkey, tomatoes, spinach, jalapeno, oregano, basil, parsley, salt, and pepper. Mix well.
Once quinoa is cooked, transfer to meat mixture and mix well again until well blended.
On a large baking sheet, spray lightly with cooking spray. Line the bell peppers with hollowed middles facing up. Scoop about 1/2 cup of meat mixture into each bell peppers center. Add more as needed.
Bake at 375 for 35 to 45 minutes or until ground beef/turkey is completely cooked. With 5 minutes remaining in cooking time, sprinkle with cheese and serve!