Southern Cornbread Dressing Muffins

Recipe from saturdayeveningpost.com

3 cups crumbled cornbread
2 cups crumbled buttermilk biscuits
2 tablespoons butter
1/2 cup chopped red & green bell pepper
1/2 cup chopped onion
1/2 cup chopped celery (optional)
1 cup chicken broth
1/2 cup milk
1 large egg, lightly beaten
1 teaspoon poultry seasoning
1/2 teaspoon rubbed sage
1/4 teaspoon black pepper
Cooking spray

Preheat oven to 375 F.
Melt butter in a skillet; add bell pepper, onion, and celery, and cook over medium-high heat until tender, stirring often. Add vegetables to crumbs in bowl. Combine broth and next 5 ingredients. Pour over crumb mixture and toss gently to mix. Spoon mixture into muffin cups coated with cooking spray. Bake for 35 minutes until lightly browned. Let stand for 10 minutes before removing from pans.