Fabulous Rhubarb Cake

Preheat oven to 350°F (175°C). Grease and flour a 9-inch square baking pan.

Cream together butter or margarine, brown sugar, and white sugar in a large bowl until light and fluffy, about 2-3 minutes.

Beat in the egg, then stir in applesauce and vanilla until well combined.

In a separate bowl, whisk together flour, soda, and salt.

Gently fold the dry ingredients into the wet ingredients until just combined, being careful not to overmix.

Fold in the finely cut rhubarb until evenly distributed throughout the batter.

Pour the batter into the prepared baking pan, spreading it evenly.

Bake in the preheated oven for 35 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.

Remove from oven and allow the cake to cool in the pan for 10 minutes before turning out onto a wire rack to cool completely.