Steps:

• Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 7x11 inch baking pan or casserole dish.
• Combine sugar, flour and butter. Use a fork to cut butter in until mixture resembles coarse crumbs. Set aside 1/2 cup of this mixture to use as topping.
• To the remaining flour mixture, add cinnamon, cloves, baking soda and salt. Lightly stir in the buttermilk and egg. Pour batter into prepared pan. Sprinkle cake with reserved topping.
• Bake in preheated oven for 25 minutes, until a toothpick inserted into center of the cake comes out clean.

Steps:

• Place rack in center of oven, and heat oven to 325 degrees. Lightly brush a 9-by-12 1/2-inch baking pan with canola oil, dust with flour, and tap to remove excess. Set aside. In a medium bowl, sift together 1 1/2 cups flour, granulated sugar, baking powder, and salt; set aside. In a second bowl, whisk together egg, milk, canola oil, and vanilla. Using a rubber spatula, fold dry ingredients into egg mixture.
• Spread batter evenly into prepared pan, and set aside. In a medium bowl, combine remaining 2 1/2 cups flour, brown sugar, and cinnamon. Pour melted butter over flour mixture, and toss with a rubber spatula until large crumbs form. Sprinkle crumbs over batter.
• Transfer pan to oven, and bake, rotating pan after 10 minutes. Continue baking until a cake tester comes out clean, about 10 minutes more.
• Transfer baking pan to a wire rack to cool. Dust with confectioners' sugar. Using a serrated knife or bench scraper, cut into 3-inch squares. Store in an airtight container for up to 3 days.