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1
Place an oven rack in the lower 1/3 of the oven.
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2
Preheat the oven to 400 degrees F. Line 2 baking sheets with parchment paper.
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3
Place the pastry on the prepared baking sheets.
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4
Using the tines of a fork, prick the top of the pastry all over.
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5
Cover the pastry with parchment paper and place another baking sheet on top.
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6
Bake for 25 minutes until golden.
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7
Remove the top baking sheets and parchment paper.
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8
Set aside to cool.
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9
Preheat a grill pan or preheat a gas or charcoal grill.
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10
Season the chicken with salt and drizzle with olive oil.
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11
Grill until the chicken is cooked through, about 5 to 6 minutes on each side.
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12
Set aside to cool.
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13
In a small bowl, mix together the mayonnaise and cayenne pepper.
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14
To assemble the Napoleons: Place 4 pieces pastry on a work surface.
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15
Slice each chicken breast diagonally into 6 (1/4-inch thick) slices.
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16
Place 3 chicken breast slices on each piece of pastry.
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17
Place 1/4 cup of spinach and 1 avocado slice on top.
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18
Spread 1 teaspoon of the mayonnaise mixture on the underside of another 4 pieces of pastry to create the middle layer of each Napoleon.
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19
Place on top.
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20
Repeat the layering.
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21
Each Napoleon should be completed with a piece of pastry as its top.
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22
Arrange the Napoleons on a platter and serve.
