https://www.simplyrecipes.com/cherry-pie-bars-recipe-7506048 
Ingredients
For the filling

3 tablespoons cornstarch
3 tablespoons water
3 1/2 cups pitted cherries, fresh or frozen
1/2 cup sugar
1 tablespoon lemon juice
For the crust

2 1/4 cups (270g) all-purpose flour
1/2 teaspoon baking powder
1/4 teaspoon salt
1 cup unsalted butter, softened
1/2 cup (100g) sugar
1 egg
1 teaspoon vanilla extract
For the icing (optional)

1 cup (115g) powdered sugar
2 tablespoons heavy cream
1/2 teaspoon vanilla extract