- Heat oven to 425°F.
- Bring butter, milk and sour cream to full rolling boil in medium saucepan on medium heat, stirring frequently. Add flour (all at once); stir vigorously with wooden spoon until mixture forms ball and pulls away from side of pan. Cook 1 min. or until liquid is cooked off, stirring constantly. Spoon into large bowl; cool 5 min.
- Add eggs, 1 at a time, beating with mixer after each addition until well blended. Continue to beat until dough is smooth and shiny. Stir in cheese and potatoes until well blended. Drop tablespoonfuls of dough, 1-1/2 inches apart, onto baking sheets sprayed with cooking spray to form 32 puffs.
- Bake 28 to 32 min. or until firm and golden brown.