Preheat the oven to 425 degrees Fahrenheit.
In a medium pot, add thawed cherries, lemon zest of 1 lemon, and granulated sugar. Cook over medium heat until the cherries begin to release juice and liquid forms in the bottom of the pot.
Add vanilla and ¼ cup lemon juice into the pot. Continue stirring over heat until the filling warms through and begins to simmer.
In a small bowl, combine the cornstarch and water to form a slurry. Mix until the cornstarch completely dissolves into the water.
Add the slurry into the cherry mixture and stir until the filling thickens (about 3-5 minutes). You will know the filling is ready when it coats the back of a wooden spoon and seems slightly gelatinous.
Remove the filling from the heat and allow it to cool completely as you roll out the pie crust.
Lay one sheet of pie crust in the bottom of an ungreased glass 9×2” pie pan. Use your hands to lightly press the crust into the bottom edges of the pan.
Pour the cooled cherry filling into the bottom crust.
Place the second pie crust over the top of the filling. Use your fingers to pinch together the top and bottom pie crusts around the edges. Then use your thumb and forefinger to press the dough into scalloped edges. Using a knife, cut a few slits in a circle around the center of the pie.
Bake in the oven for about 45 minutes or until the crust is brown.
Remove the pie from the oven and allow it to cool on the countertop for an hour. Then, transfer it to the fridge. Allow the pie to cool completely and set up before serving.
Serve alone or warm with ice cream. Enjoy!