Mix together butter, cream cheese, flour, and salt until it comes together in a ball.
Divide dough in half. Then, divide each half into half again. You should have 4 pieces of dough. Divide each of these pieces into thirds so you have 12 pieces of dough.
Spray a muffin pan with nonstick spray, then place a dough ball in each muffin tin.
Press the dough into the bottom and up the sides of each muffin tin.
Divide cherry pie filling evenly between crusts.
Bake tarts for 12 to 15 minutes, or until crust is golden brown.
Let tarts cool, then served topped with whipped cream. Enjoy!