Made for the May Curious Cuisiners meeting by Mary Shreves. This was a meeting favorite- who doesn't love mac and cheese and especially with a healthy twist. This one is only 242 calories per cup serving.
Preheat oven to 375. Prepare large casserole dish with nonstick spray. Cook macaroni according directions, omitting salt or fat. Set aside.
Heat large pot over medium heat. Place flour in pot and gradually add milk, stirring with whisk until well blended. Continue to cook on medium heat, stirring frequently until thickened, about 6 minutes. Add cheeses and stir until melted. stir in Worcestershire and pepper.
Remove from heat. Add spinach and mix well. Add tomatoes and macaroni and mix well to combine.
Pour into prepared pan. Bake uncovered, 30-35 minutes. Remove from oven to cool.