Toast the Pecans (Optional but Recommended). For deeper flavor, spread chopped pecans on a baking sheet and toast at 350°F for 5 to 7 minutes, stirring once halfway through. Let them cool slightly before mixing into the filling ingredients. This step enhances the nutty flavor and adds a subtle crunch to the cookie base.
Mix the Dough. In a large bowl or bowl of a stand mixer, cream together softened butter and sour cream on low speed until smooth. Gradually add the sifted flour, about ½ cup at a time, until a soft cookie dough forms. Shape the dough into a ball, wrap in plastic wrap, and refrigerate for 1 hour.
Prepare the Filling. While the dough chills, whisk together the eggs, coconut sugar, butter, and vanilla extract in a medium bowl until smooth. Fold in the chopped toasted pecans using a silicone spatula until evenly coated.
Preheat and Prep. Preheat your oven to 350°F. Lightly grease two 12-cup mini muffin tins (or line with parchment paper rounds if you prefer). These tins are essential for achieving the perfect cookie form and buttery crust.
Shape the Dough. Pinch off a tablespoon of dough and roll it into a ball. Press each piece into the muffin cup, forming a small shell similar to a pie crust. You can use your fingers or a shot glass to press the dough down evenly into the tin. Just be sure not to make the dough too thin or the filling may seep through.
Fill and Bake. Spoon about one teaspoon of pecan filling into the center of each cookie. Bake for 15 to 20 minutes, or until the crust turns a light golden brown and the filling looks set.
Cool. Remove from the oven and let the cookies cool in the pan for 5 minutes before transferring them to a wire rack. Allow to cool completely before serving or storing in an airtight container.