Saute' mushrooms, onion and garlic in 3 Tbsp. butter until tender. Stir in flour, gradually add milk and bring to a boil. Cook and stir for 2 minutes or until thickened. Remove from heat and add mayonnaise. Add rest of ingredients, mixing well. Melt 1 Tbsp. butter and toss with cornflake crumbs. Sprinkle over casserole. Bake uncovered at 350 degrees F for 30-35 minutes.
By Robin from Washington, IA
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