Slow Cooker Lamb Stew with Butternut Squash and Marsala Wine

Ingredients (16)

• + 1 pound cubed lamb stew meat add to pantry
• + ½ teaspoon salt, or more to taste add to pantry
• + ½ teaspoon ground black pepper add to pantry
• + 2 teaspoons butter add to pantry
• + 1 medium sweet onion, diced add to pantry
• + 1 medium shallot, diced add to pantry
• ✓ 4 cloves garlic, minced
• + 2 cups diced butternut squash add to pantry
• ✓ 2 cups chopped white mushrooms
• + 1 cup diced sweet potato add to pantry
• + 1 cup diced carrots add to pantry
• + 1 cup diced celery add to pantry
• + 2 cups beef bone broth add to pantry
• + 1 cup Marsala wine add to pantry
• ✓ 4 sprigs fresh rosemary
• + 4 sprigs fresh thyme, or to taste add to pantry