Hearty Slow Cooker Beef Stew

Ingredients

• 3 pounds cubed beef stew meat (boneless chuck roast)
• 1/4 cup all-purpose flour
• 1/2 teaspoon salt
• 1/2 teaspoon ground black pepper
• 3 tablespoons olive oil
• 1 cup baby carrots
• 4 Yukon Gold potatoes, cubed
• 3 celery stalks, diced
• 2 teaspoons dried thyme
• 2 cups beef stock
• 1-ounce package dry onion soup mix
• 1 tablespoon Worcestershire sauce
• 3 tablespoons salted butter
• 1 medium onion, diced
• 3 garlic cloves, minced
• 1/2 cup red wine
• 1 tablespoon all-purpose flour (for slurry)
• 1/4 cup cold water (for slurry)