Combine all ingredients in a saucepan, bring to a boil, then reduce heat to med-low and simmer for about 10-20 min. I just simmer the whole time I am making Grilled Italian Mozzarella and Tomato Sandwiches and it works out great.
Preheat oven to 375º F. Butter or line 12 regular muffin cups. Fry up chicken in the oil until cooked through. Add onion and chicken broth, simmer for a few minutes. Add frozen vegetables and seasonings. heat until all ingredients are thoroughly heated, stirring occasionally. Cool for about 5 minutes, then stir in cheese. This is your chicken mixture.
In a mixing bowl, stir baking mixture ingredients together until blended. Scoop a Tablespoon of your Baking Mixture into each muffin cup. Add 1/4 cup Chicken Mixture to each muffin cup. Top off each cup with another Tablespoon of your Baking Mixture.
Bake at 375º for 25-30 minutes or until toothpick inserted comes out clean. Cool for 5-15 minutes, then serve.