Preheat oven to 325°F.
Spray a 9x13 in. pan with cooking spray or line with parchment paper. Set aside.
In a medium bowl, sift together 1 1/2 cups flour, granulated sugar, baking powder, and salt.
In a separate bowl, whisk together egg, milk, canola oil, and vanilla.
Using a rubber spatula, fold dry ingredients into the wet ingredients.
Spread batter into the prepared pan (batter will be thick).
Spread the cream cheese mixture over the batter.
Distribute the strawberry slices and blueberries over the cream cheese layer.
Sprinkle crumb mixture over the berries, leaving some large chunks.
Bake for 20-25 minutes, or until set in the middle.
Cool completely in the pan, and dust with confectioners' sugar.
Cut with a serrated knife.