Preheat the oven to 350 degrees. Coat a muffin tray with cooking spray.
Roll out the pie crusts on a floured surface, then smooth them out with a rolling pin.
Use a cookie cutter or a ramekin to cut 4-inch circles out of the pie crusts.
Roll the leftover dough up into a ball, then roll it out with a rolling pin and cut out more 4-inch circles. I had enough to fill the entire muffin tray because I rolled my pie dough out pretty thin.
Place the circles (bottom crusts) into the muffin tray, pressing them firmly against the sides.
Scoop 2 tablespoons of either cherry or lemon filling into each muffin cup.
Using different cookie-cutter shapes, we used flowers and regular circular cookie cutters to make the top crusts.
Top the pies with the crusts. Make sure you slice vents into the top of each pie if it's completely covered with a crust.
Mix the egg and water, and brush the tops of each pie with the mixture.
Put the muffin tray in the oven and bake for 30 minutes or until the crust is golden brown.
Cool the pies for 4-5 minutes on a wire cooling rack.