The Easiest Lasagna Soup

Ingredients

• 2 Tbsp. olive oil
• 1 pound bulk Italian sausage
• 1 large yellow onion, diced
• 6 garlic cloves, minced
• 1 tsp. kosher salt, divided
• 1/2 tsp. ground black pepper
• 1 Tbsp. dried Italian seasoning
• 1/2 cup red or white wine (optional, see notes)
• 1 (14-oz.) can diced tomatoes
• 24 ounces jarred marinara sauce (see notes)
• 4 cups low-sodium vegetable broth
• 2 cups short-cut pasta, such as mafalda (pictured) or rotini
• 8 ounces frozen chopped spinach
• Grated parmesan, for serving