Preheat the oven to 400°F. Place the fruit in a mixing bowl. Add the sugar, cinnamon, salt, cornstarch, and almond extract. Stir to combine and then let the fruit rest on the counter while preparing the crust.
In a separate mixing bowl, stir together the flour, oats, and brown sugar. Add the melted butter and stir to combine. Press half of this mixture into a well-buttered or parchment-lined 9x13 pan. Pour the fruit over the bottom crust and then sprinkle the rest of the dry mixture on top.
Bake for 30-35 minutes, until the crust turns golden brown. Serve warm from the oven or let cool completely and slice into servings. Enjoy!
Notes
I can not sing the praises of parchment paper enough when it comes to recipes like this one. Let the bars cool completely and then simply lift them out of the pan to easily slice them.