In a stand mixer or large bowl with a hand mixer, beat cream cheese until smooth. Add butter and mix again. Once combined, add flour and blend just until the dough comes together.
Place in a covered dish and refrigerate at least 6 hours.
Next day, preheat oven to 350°F. Grease 3 24-cup mini muffin pans with butter or nonstick cooking spray.
Using a cookie scoop or 2 spoons, add approximately 1 tablespoon of the dough to each muffin pan well.
Flour a tart press or your fingers and press the dough down and up the sides of each muffin well.
Evenly sprinkle the pecans in each muffin pan well.
For the filling, in a bowl, whisk together eggs, brown sugar, melted butter, salt, and vanilla until smooth.
Spoon this mixture evenly over the top of each prepared muffin well. DO NOT overfill. The crust should be exposed above the filling. Depending on your crust press depth, pecan fill and topping, you might have a little filling leftover. Discard or save for later.
Bake 20-26 minutes or until the filling is set and crust is golden around the edges.
Cool 1-2 minutes then transfer the tarts to a cooling rack. Allow them to cool completely.