Spray the inside of your crockpot with cooking spray to prevent sticking and make cleanup easier.
In a skillet over medium heat, add olive oil. Once hot, sauté diced onion and bell pepper for about 5 minutes until soft and fragrant. Add minced garlic and stir for another minute.
Push vegetables to one side of the skillet and add lean ground turkey. Cook until browned, about 5-7 minutes, breaking it up as you go. Stir everything together and season with chili powder, cumin, salt, and pepper.
Transfer the turkey mixture into the prepared crockpot. Add quinoa, black beans, corn, salsa, fire-roasted diced tomatoes with juices, chicken stock, and red enchilada sauce. Stir until well combined.
Cover the crockpot and cook on low for 4-6 hours or on high for 2-3 hours until quinoa is cooked and fluffy.
About 15 minutes before serving, sprinkle cheese over the top of the quinoa mixture. Cover and allow cheese to melt.
Once cheese is melted, stir gently to combine. Garnish with fresh cilantro and any additional desired toppings. Serve and enjoy!