Yield
Makes 6 to 8 servings

How to Make It

Step 1

Melt 1/4 cup butter in a large skillet over medium heat; add bell pepper, onion, and mushrooms, and saute 5 minutes or until tender.

Step 2

Whisk together flour and milk until smooth; stir into vegetable mixture, and cook, stirring constantly, 5 minutes or until thickened. Remove from heat; add cheese, stirring until melted.

Step 3

Stir in tuna and next 4 ingredients; spoon into a lightly greased 13- x 9-inch baking dish.

Step 4

Bake, covered, at 350° for 25 minutes. Stir together breadcrumbs and 2 tablespoons melted butter; sprinkle over casserole, and bake 5 more minutes.

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