Lightly spray a 12-serving muffin pan* with nonstick spray. (I had no problems releasing the cookies from the pan, but you can also line the muffin cups with 2-inch parchment circles for a foolproof release. I don't recommend cupcake liners since the cookies will stick to the ridges of the liners.)

In a medium-size bowl, whisk together the flour, baking powder and salt until well blended.

In a large bowl, beat the butter and powdered sugar with an electric mixer until light and fluffy. Mix in the flour mixture on low speed or by hand, just until combined.

Press generous tablespoon size (about 20g each) portions of dough into the bottoms and 1/4-inch up the insides of the muffin pan cups with a pastry tamper dipped in flour. You can also use the bottom of a flat shot glass. Set aside in the refrigerator while you prepare the pecan filling.

Preheat the oven to 350ºF (180ºC). In a medium-size saucepan, combine the pecans, butter, brown sugar and maple syrup over medium heat. Bring to a simmer and let the mixture bubble gently for 2 minutes. Remove the pan from the heat and stir in the heavy cream, cinnamon and salt. Return the pan to the heat and let the mixture bubble gently on low heat for 2 more minutes. Stir in the vanilla and let the mixture cool to lukewarm.

Top the cookie crusts evenly with the pecan filling mixture. Bake until the cookies are set and the topping is golden brown and bubbly, about 14-16 minutes. Cool the cookies completely in the pan. Once cool, remove the cookies from the pan by running a small offset spatula or paring knife around the inside perimeter of the muffin cups to loosen them.