Place the chicken breasts in the slow cooker.
In a small bowl, combine the olive oil, minced garlic, chicken broth, whole grain mustard, lemon juice and zest, and dried rosemary.
Pour the mixture over the chicken in the slow cooker.
Season the chicken with salt and pepper to taste.
Cover the slow cooker and cook on low for 6 hours or on high for 3 hours, until the chicken is cooked through and tender.
Optional: Once cooked, broil the chicken breasts in the oven for 2-3 minutes to get a slightly golden top.
Variations & Tips:
For a creamy version, stir in a splash of heavy cream or coconut milk into the sauce during the last 30 minutes of cooking.
Add a pinch of red pepper flakes to the garlic mustard mixture for a spicy kick.
Incorporate vegetables like carrots or potatoes around the chicken in the slow cooker to create a one-pot meal.
Each variation adds its own unique flair to this versatile and delightful dish!
