In a large bowl combine flour and sugar. Cut in butter with a pastry cutter. Cut in beaten egg. Divide dough in half.
To one half add baking powder and pinch of salt and mix until well combined, and press into prepared baking pan to make the crust.
To the cherries add 1/2 cup sugar and cornstarch and mix gently to coat the cherries completely.
Spread the cherries evenly over the crust.
Crumble the remaining dough over top of the cherries.
Bake for 50 minutes (or until top is just lightly browned).
Cool before cutting into desired size.
Notes
Store in an airtight container at room temperature for up to 3 days, or freeze for up to 3 months.Cut small bars for a bite size snack or larger squares for a dessert serving with ice cream.