Herb-Cheese Palmiers

Ingredients

• 1 sheet puff pastry thawed (from a 17.3-ounce package)
• 1 tablespoon olive oil extra virgin extra-virgin
• 0.3 cup sharp cheddar cheese grated
• 3 tablespoons parmesan grated
• 3 tablespoons herbs: rosemary fresh chopped (such as thyme, sage, and oregano)
• 0.3 teaspoon coarse salt 
• 1 large egg yolk 
• 0.5 teaspoon water 

Equipment

• bowl
• baking sheet
• oven
• plastic wrap

Directions

1. Preheat oven to 375 degrees, with racks in upper and lower thirds. On a lightly floured surface, roll out puff pastry to a 10-by-16-inch rectangle.
2. Brush with olive oil and sprinkle with cheddar, Parmesan, herbs, and salt. Fold dough lengthwise into thirds (like a letter), then fold in half. Refrigerate until slightly firm, about 10 minutes.
3. Cut dough crosswise into 1/4-inch-thick slices (you should have about 38).
4. Place slices on 2 large baking sheets. Refrigerate until firm, about 30 minutes. (To store, cover with plastic wrap and refrigerate, up to 1 day.) In a bowl, combine egg yolk with water.
5. Brush tops of palmiers with egg wash.
6. Bake until golden brown, about 25 minutes, rotating sheets halfway through.