Fresh Spinach Gratin - cooking recipe

Ingredients

1 tablespoon olive oil
1 small onion, diced
1 teaspoon salt
1/2 teaspoon ground black pepper
1/2 teaspoon dried thyme
2 tablespoons all-purpose flour
1 1/2 pounds baby spinach, roughly chopped
1 cup half-and-half
1 1/2 cups shredded Swiss cheese, divided
3/4 cup dry bread crumbs
3 tablespoons butter, melted

Preparation

Preheat the oven to 400 degrees F (200 degrees C).
Heat oil in a large skillet over medium heat and cook onion until soft and translucent, about 5 minutes. Season with salt, pepper, and thyme. Sprinkle flour over onion mixture and cook until a thick paste forms, about 1 minute.
Place spinach in a large soup pot and cover. Heat on low until spinach begins to wilt, about 4 minutes. Turn heat off and add half-and-half, 1 cup Swiss cheese, and the onion mixture. Stir to combine and transfer to a 9-inch gratin dish.
Combine breadcrumbs and remaining 1/2 cup cheese in a bowl. Pour melted butter over the top and stir to combine. Evenly spread breadcrumb mixture over the spinach.
Bake in the preheated oven uncovered for 20 minutes. Let cool for 5 minutes before serving.