Combine Dijon, maple syrup, vinegar, salt, and pepper in a bowl and mix well.
Place chicken in slow cooker and pour sauce on top.
Cook in slow cooker on high for 4 hours or low for 8 hours.
To stock your freezer:
Place chicken in a freezer container and pour mixture over chicken. Seal, while removing the air, and label with the date and the following: “Maple Dijon Chicken: Thaw in refrigerator overnight and cook in slow cooker on high for 4 hours or low for 8 hours.”