Prepare Mustard Sauce as directed.
Cover and refrigerate.
For pastry, combine flour, cornmeal, Parmesan cheese and salt in medium mixing bowl.
Add Oil.
Stir with fork until moistened.
Add water.
Mix well.
Divide dough in half.
Form each half into a ball.
Place 1 ball between 2 large sheets waxed paper.
Roll dough 1/8 inch thick.
Remove top sheet waxed paper.
Cut dough into 2-inch circles.
Repeat with remaining dough.
For filling, mix all ingredients in small mixing bowl.
Preheat oven to 375 °F.
To assemble puffs, place one pastry circle on ungreased baking sheet.
Place 1 scant teaspoon filling in center of circle.
Top with another pastry circle.
Press edges of circles together with fork.
Repeat with remaining pastry circles and filling.
Bake puffs at 375 °F, 10 to 15 minutes, or until light golden brown.
Remove to wire rack.