Yield
8 servings (serving size: about 1 cup)

How to Make It

Step 1

Preheat oven to 375°.

Step 2

Place bread in a food processor, pulse until coarse crumbs form to measure 1/2 cup; set aside.

Step 3

Lightly spoon flour into a dry measuring cup, and level with a knife. Place flour in a large saucepan. Gradually add milk, stirring constantly with a whisk. Bring to a boil; reduce heat, and simmer mixture for 2 minutes or until thick. Remove from heat; stir in 2 tablespoons Parmesan and the next 5 ingredients (2 tablespoons Parmesan through chipotle chiles), stirring until cheese melts. Combine cheese sauce, pasta, onions, and tomatoes in a bowl.

Step 4

Spoon the mixture into a 13 x 9-inch baking dish coated with cooking spray. Combine 2 tablespoons remaining Parmesan and breadcrumbs; sprinkle over pasta mixture. Cover and bake at 375° for 10 minutes. Uncover and bake for an additional 10 minutes or until mixture is bubbly.

Step 5

Note: To make ahead, assemble casserole as directed, but stop before adding breadcrumb topping. Cover and refrigerate overnight. Let stand 30 minutes at room temperature; sprinkle with breadcrumb topping, and bake as directed.

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