Espresso-Banana Napoleons

Preparation Position rack in center of oven and preheat to 350°F. Line heavy large baking sheet with parchment paper. Place 1 phyllo sheet on work surface (cover remaining sheets with plastic wrap and damp towel). Brush phyllo sheet with butter. Sift 2 teaspoons powdered sugar over. Top with second phyllo sheet. Brush with butter; sift 2 teaspoons powdered sugar over. Repeat with remaining phyllo, butter and 2 teaspoons powdered sugar. Cut phyllo stack into eighteen 3-inch squares. Transfer half of phyllo squares to prepared baking sheet. Cover remaining phyllo squares with plastic. Cover phyllo squares on baking sheet with large parchment sheet, then top with another baking sheet. Bake until golden, about 14 minutes. Transfer to racks; cool. Repeat with remaining phyllo squares. (Can be made 2 days ahead. Store airtight at room temperature.) For each napoleon, place 1 phyllo square in center of plate. Spread 1 tablespoon pastry cream over. Arrange 3 banana slices over cream. Sprinkle 1 1/2 teaspoons walnuts over. Spread 1 tablespoon pastry cream atop second phyllo square. Place phyllo square, cream side down, atop bananas, offsetting corners of phyllo squares. Repeat with second layer of pastry cream, bananas and nuts. Spread 1 tablespoon pastry cream atop third phyllo square. Place phyllo square, cream side down, atop bananas, offsetting corners of phyllo squares. Sprinkle with remaining nuts. Sift powdered sugar over and serve napoleons immediately.

Preparation Position rack in center of oven and preheat to 350°F. Line heavy large baking sheet with parchment paper. Place 1 phyllo sheet on work surface (cover remaining sheets with plastic wrap and damp towel). Brush phyllo sheet with butter. Sift 2 teaspoons powdered sugar over. Top with second phyllo sheet. Brush with butter; sift 2 teaspoons powdered sugar over. Repeat with remaining phyllo, butter and 2 teaspoons powdered sugar. Cut phyllo stack into eighteen 3-inch squares. Transfer half of phyllo squares to prepared baking sheet. Cover remaining phyllo squares with plastic. Cover phyllo squares on baking sheet with large parchment sheet, then top with another baking sheet. Bake until golden, about 14 minutes. Transfer to racks; cool. Repeat with remaining phyllo squares. (Can be made 2 days ahead. Store airtight at room temperature.) For each napoleon, place 1 phyllo square in center of plate. Spread 1 tablespoon pastry cream over. Arrange 3 banana slices over cream. Sprinkle 1 1/2 teaspoons walnuts over. Spread 1 tablespoon pastry cream atop second phyllo square. Place phyllo square, cream side down, atop bananas, offsetting corners of phyllo squares. Repeat with second layer of pastry cream, bananas and nuts. Spread 1 tablespoon pastry cream atop third phyllo square. Place phyllo square, cream side down, atop bananas, offsetting corners of phyllo squares. Sprinkle with remaining nuts. Sift powdered sugar over and serve napoleons immediately.