6 medium Russet potatoes, peeled, boiled, and cubed
1 cup mayonnaise (no substitutions)
1/2 cup chopped onion
2 cups shredded sharp Cheddar cheese
1/8 teaspoon cayenne pepper (optional)

In a large bowl, combine all ingredients. Transfer mixture to an ungreased 9x13-inch baking dish and bake, uncovered, at 350°F for 45 minutes.

Submitted by: Carol