Slow Cooker Quinoa Sweet Potato Chicken Recipe

2 (14.5 ounce) cans chicken broth

2 ½ cups chopped cooked chicken

or more to taste

1 (28 ounce) can petite-cut diced tomatoes with garlic and olive oil

2 (16 ounce) cans red kidney beans

drained and rinsed

1 (15 ounce) can black beans

drained and rinsed

2 large sweet potatoes

peeled and cut into cubes

½ cup quinoa

1 tablespoon dried minced onion

1 tablespoon chili powder

1 teaspoon minced garlic

¼ teaspoon red pepper flakes

salt and ground black pepper to taste