Gather the ingredients. Preheat the oven to 350 degrees F (175 degrees C). Lightly butter a 9x13 inch baking pan. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Beat butter and sugar together in a large bowl with an electric mixer until light and fluffy in color. Beat in egg and vanilla. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Sift 2 cups flour, baking soda, and salt together in a separate bowl; add alternately with buttermilk to butter mixture. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Toss rhubarb with 1 tablespoon flour, and stir into batter. Spoon batter into prepared baking pan and smooth the surface. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Mix brown sugar, 1/4 cup butter, and cinnamon together; sprinkle evenly over batter. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Bake in preheated oven until a toothpick inserted into the cake comes out clean and the top is golden, about 45 minutes. Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Enjoy! Jen Causey / Food Stylist: Chelsea Zimmer / Prop Stylist: Lydia Pursell
Old-Fashioned Rhubarb Cake · Dinner Match Lab | Dinner Match Lab