Step 1: Preheat oven to 325 F, the place oven rack rack in center of oven.
Step 2: Grease a 9x13 inch baking pan.
Step 3: In a medium bowl, sift together 1 1/2 cups flour, sugar, baking powder, and salt; set aside.
Step 4: In a second bowl, whisk together the egg, milk, canola oil, and vanilla; using a rubber spatula, fold dry ingredients into egg mixture.
Step 5: Spread batter evenly into prepared pan; set aside.
Step 6: In a medium bowl (this is your crumb topping) combine remaining 2 1/2 cups flour, brown sugar, and cinnamon; mix in melted butter using a spatula gently combine until large crumbs form.
Step 7: Top batter evenly with crumb topping.
Step 8: Bake for 35 to 40 minutes or until the cake tests done.
Step 9: Transfer pan to a wire rack to cool.
Step 10: Dust with confectioners' sugar.
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