Slow Cooker Green Bean Casserole Recipe

Ingredients

• 2 pounds green beans, trimmed and cut into 1 1/2-inch pieces
• 3 tablespoons unsalted butter, divided
• 1 pound sliced cremini mushrooms
• 2 teaspoons salt, plus more to taste
• 3 garlic cloves, minced
• 1 tablespoon fresh thyme leaves
• Large pinch red pepper flakes
• 1/4 cup all-purpose flour
• 1 1/2 cups chicken stock
• 1 1/2 cups half and half
• 1 teaspoon soy sauce
• 1 teaspoon red wine vinegar
• A few cracks freshly ground black pepper
• 1 pound (about 8 medium) shallots
• 2 cups vegetable oil