Spinach-Tomato Macaroni & Cheese

Preheat oven to 350 degrees F.

Cook macaroni according to package directions, omitting salt. Drain and set aside.

Meanwhile, heat oil in a large skillet over medium-high heat. Add onion, garlic, and 1/4 tsp salt; cook, stirring often, until the onion is tender, 3 to 4 minutes. Gradually add spinach, stirring until wilted and adding 1 Tbsp. water at a time, if needed. Transfer the mixture to a large bowl.

Add tomatoes to the skillet and cook over medium-high heat until they begin to soften, about 1 minute. Transfer to the bowl with the spinach mixture.

Reduce heat to medium and add butter to the pan. When the butter has melted, whisk in flour, pepper, and the remaining 1/2 tsp. salt. Cook, whisking constantly, for 2 minutes. Gradually whisk in milk and broth. Cook, whisking, until thickened and bubbly, 1 to 2 minutes. Gradually whisk in 3/4 cup cheese until melted.

Add the macaroni and sauce to the bowl with the spinach mixture; mix well. Transfer to an 11x7-inch baking dish and sprinkle with the remaining 1/4 cup cheese.

Bake until the cheese is melted, 10 to 15 minutes.