My favorite crockpot recipes to try are always ones that I can use straight-from-the-freezer meat.  This is cooking in my crockpot right now - we'll see tonight how my family likes it.  (Update:  We've now made this twice because the chicken comes out super tender and juicy - everyone LOVES it!)

Ingredients

4 frozen chicken breasts (or thighs)
1 small onion, finely chopped
1 1/2 c. applesauce
1 Tbsp apple cider vinegar
1/4 tsp cinnamon
1/2 tsp black pepper
2 cloves minced garlic
1/4 tsp red pepper flakes (optional)

Directions
Place the frozen chicken pieces in the crockpot.  Add the chopped onion.  In a bowl, mix the applesauce, vinegar, garlic, and spices together.  Pour on top of the chicken.

Cover and cook on low for 5-7 hours, or high 3-4 hours.

Serve with rice or quinoa.