Matrimonial Bliss

Preheat oven to 350°F (175°C). Prepare a 9x13 inch baking pan by lightly greasing it with butter or margarine.

Combine 5/8 cup butter, 1 cup brown sugar, 1 egg, 1 cup all-purpose flour, 1 cup rolled oats, 1 cup flaked coconut, and 1 teaspoon baking soda in a large mixing bowl.

Mix the ingredients until well combined and the mixture forms a crumbly, unified dough.

Press half of the oat mixture firmly into the bottom of the prepared baking pan to create an even base layer.

Spread 1/2 cup rhubarb jam evenly over the oat base layer.

Crumble the remaining oat mixture over the jam layer, distributing it evenly to cover the filling.

Bake in the preheated oven for 20-25 minutes until the top is light golden brown.

Remove from the oven and allow to cool in the pan for at least 10 minutes before cutting into bars and serving.