1 cup water 1/4 cup butter 1/2 tsp salt 1 1/2 cups all-purpose flour 3 eggs 1 cup Cheddar, Emmenthal, or Gruyere cheese, grated 1 cup Parmesan or Asiago, grated Preheat oven to 425 degrees and lightly grease a baking sheet. Combine water, butter and salt in medium saucepan and bring to bubbles over medium-high heat Continue cooking, stirring, until butter melts Add flour all at once and cook, stirring constantly, until the dough holds together in a ball, 1 to 5 minutes Remove from heat Add eggs, one at a time, beating hard after each addition Stir in the cheeses; if you would like you could substitute diced sauteed mushrooms; minced cooked shrimp or crab; minced artichoke hearts; grated zucchini; or another filling, for the first cheese Drop by teaspoonfuls onto the baking sheet and bake until golden brown, 10 to 15 minutes