Preheat the oven to 350°F, rack in the middle. Use a non-stick mini muffin pan. If you don’t have a non-stick one, lightly spray the wells.
To make the tart dough, in the bowl of a stand mixer fitted with the paddle attachment, cream together the butter and cream cheese on medium speed until smooth. ~5-7 minutes. Turn the mixer off and add in the flour and salt. Turn on low and mix until a soft dough forms.
Divide the dough into 24 equal balls, each about 1 tablespoon. Press the balls of dough into the Mini Muffin Pan , using a Tart Dough Press or your thumbs to press the dough against the sides to form a shell all the way up the well of the pan.
To make the filling, whisk together the egg, sugar, butter, vanilla, and salt in a bowl.
Sprinkle 3/4 teaspoon of nuts into each shell.
Top with a teaspoon of the egg mixture or until the mixture reaches the top of the dough.
Place a pecan half in the center.
Bake 20-25 minutes or until light golden brown.
Remove from oven.
Allow to cool in the pan for 3 minutes.
Using a Thin Blade Spatula carefully remove from the pan and allow to cool completely.