Preheat the oven to 350°F. Grease a 9x13 baking dish.
In a medium mixing bowl, beat together the cake mix, eggs, and vegetable oil. Beat with a hand (or stand) mixer until combined. The mixture will be thick.
Remove half of the mixture and set aside. Press the remaining dough into the bottom of the prepared baking dish.
Bake for 15 minutes, then remove from the oven.
Spread cherry pie filling over the top of the baked base. One can of pie filling will cover the pie bars lightly. Use up to 2 cans of pie filling for extra cherry-filled pie bars.
Sprinkle the reserved dough in clumps over the top of the cherry pie filling.
Return the baking dish to the oven and bake for 15 to 20 minutes longer, until the top of the bars is just beginning to brown.
Cool bars completely.
Whisk together powdered sugar, almond extract, and enough milk to make a sugar glaze. Drizzle over the top of the cooled cherry pie bars.
Cut into bars and serve.