Slow Cooker Mississippi Pot Roast

Bahan-bahan (8 porsi)

• 3 -4 pounds chuck roast
• 6 -8 whole pepperoncini ((This is about half of a 12-ounce jar.))
• approximately half the liquid from the jar of pepperoncini
• ¼ cup butter (cut into 1-inch pieces)
• .1 ounce au jus gravy mix ((1 packet))
• .4 ounces buttermilk ranch dressing mix ((1 packet))
• 1 teaspoon freshly ground black pepper (adjust to taste)