Sweet garlic chicken (slow cooker) recipe

Chicken second courses

4-6 chicken breasts 1 cup packed brown sugar ⅔ cup vinegar (I used apple cider vinegar) ¼ cup lemon-lime soda (diet or regular) 2-3 Tablespoons minced garlic 2 Tablespoons soy sauce 1 teaspoon fresh ground pepper 2 Tablespoons corn starch 2 Tablespoons water Red pepper flakes (optional)