Barbeque Beer Chicken Thighs in the Slow Cooker

Original recipe from blogger So Tasty, So Yummy: 
http://sotastysoyummy.blogspot.com/2009/07/barbecue-beer-chicken-thighs.html

INGREDIENTS

•  2 frozen chicken breasts
• 1 cup beer (I used Amber Ale)
• 1 cup ketchup
• 1/2 cup apple cider vinegar
• 1 tablespoon soy sauce
• 1 tablespoon Worchestire sauce
• 2 teaspoons mustard
• 1 cup frozen chopped onions
• 2 cloves garlic, smashed

DIRECTIONS

1. Mix ingredients, minus the chicken, in the crock pot.
2. Add chicken.
3. Cover and cook on high for 6-7 hours.
4. Serve with sides of choice (I served this with mashed potatoes and green beans).