Seitan Diavolo

Ingredients

• 1 1/2 pounds seitan, cut into 1/4-pound, hand-size slices
• 1/2 cup finely chopped fresh parsley
• 1 lemon, juiced, divided
• 1 pinch garlic powder, or to taste
• salt and ground black pepper to taste
• 16 ounces drained artichoke hearts
• 1 (26 ounce) jar spicy tomato sauce (such as diavolo)
• 1/2 cup red wine
• 1 1/2 cups onion and garlic-flavored croutons
• 1 tablespoon olive oil
• 2 cups shredded mozzarella cheese