Preheat the oven to 375 degrees F. Line the bottom of a 9×13-inch baking dish with parchment paper. Butter the sides and parchment, or spray with cooking spray, and set aside.
To make the crumb
In the bowl of a food processor, add the flour, sugar, salt, baking powder, and cinnamon. Pulse a couple of times until everything is combined. Add the butter and egg to the flour mixture. Pulse until it resembles a coarse meal.
Taking half of the crumb mixture, pat it into the bottom of your prepared pan. It will be on the thin side.
To make the filling
Rinse the food processor. In the same bowl, add the filling ingredients and pulse briefly. Do this until the berries are coarsely chopped but not puréed. Spread this mixture evenly over the crumb base.
To assemble the bars
Sprinkle the remaining crumb mixture evenly over top of the strawberry layer.
Bake for 30-35 minutes, or until the crumbs on top are lightly browned. Allow it to cool completely before cutting it into squares.