Slow Cooker Beef Stroganoff

Ingredients

• 3 tablespoons vegetable oil, divided
• 24 ounces white mushrooms, halved or quartered (if large)
• 1/4 teaspoon salt + more, to taste
• Black pepper, to taste
• 3 medium yellow onions, minced
• 1/4 cup tomato paste
• 6 garlic cloves, minced
• 1/2 ounce dried porcini mushrooms, rinsed and minced
• 1 tablespoon minced fresh thyme (or 1 teaspoon dried)
• 1/3 cup all-purpose flour
• 1½ cups chicken broth
• 1/2 cup dry white wine
• 1/3 cup soy sauce
• 2 bay leaves
• 1 (4-pound) boneless beef chuck roast, trimmed and cut into 1½-inch cubes
• 1/3 cup sour cream
• 2 teaspoons Dijon mustard
• 2 tablespoons minced fresh dill
• Reynolds Kitchens® Slow Cooker Liner