Slow Cooker Guinness® Stew

Ingredients

• 8-10 red potatoes, skin-on, quartered
• 6 carrots, peeled and sliced into thick chunks
• 2 stalks celery, cut into chunks
• 3 bay leaves
• 1/2 cup flour
• salt, to taste
• 1/2 teaspoon black pepper, plus more, to taste
• garlic powder, to taste
• 3 pounds stew meat, cubed
• 2 tablespoons olive oil, plus more, to taste
• 1 medium onion, diced
• 4 large cloves garlic, minced
• 1 (10.75-ounce) can beef broth
• 1 (8-ounce) carton baby portabella mushrooms, halved
• 2 (8-ounce) cans tomato sauce
• 1 (1-ounce) envelope onion soup mix
• 1 teaspoon dried thyme
• 1/2 teaspoon garlic powder
• 1 teaspoon creole seasoning
• 1 teaspoon Italian seasoning
• 1 (12-ounce) bottle stout beer, such as Guinness
• 1 cup frozen peas, optional