2 cups chopped (rough 1/2″) rhubarb

1/2 cup (not packed) brown sugar

1 stick (1/2 cup) butter, soft

1 cup (not packed) brown sugar

1 egg

1 teaspoon vanilla

1 cup plain whole milk yogurt

3/4 teaspoon kosher salt

1 cup all-purpose flour

1 cup semolina flour

1 teaspoon cinnamon

1 teaspoon baking soda