Preheat oven to 400F. Line a baking sheet with parchment paper.
Place the thawed 1 sheet frozen puff pastry, thawed on your prepared sheet pan. Prick holes across the surface of the puff pastry with a fork, this allows air to escape while it's baking so it doesn't puff up too much.
Bake the puff pastry on its own for about 15 minutes. It will puff up, but still be a pale golden color.
Remove from the oven and gently deflate with the back of a spoon if it has puffed up too much. Set aside while you make the almond filling.
Turn the oven down to 350F.
In a stand mixer fitted with the paddle attachment, cream the 6 Tbsp unsalted butter, softened, 3/4 cup sugar, and 1/4 tsp salt together. Add the 1 large egg, 1 tsp vanilla extract, and 1 1/2 tsp almond extract and mix until well combined.
Finally, fold in the 1 cup almond flour. You should have a thick paste.
Spread the almond paste evenly over the par-baked puff pastry, going pretty much all the way to the edge.
Scatter the 1/2 cup sliced almonds evenly over top of the almond filling.
Return to the oven and bake for another 20-30 minutes until the filling is set and the pastry is a rich golden color.
Remove from the oven and allow to cool at room temperature. Dust with powdered sugar once the pastry has cooled. Slice into wedges or squares for serving.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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