Step 1

Make the filling first by tossing plums with sugar, cornstarch, salt, and spices. Set aside.

Step 2

Preheat oven to 350 degrees Fahrenheit and line a 9-inch square baking pan with parchment paper.

Step 3

Combine flour, salt, and baking powder in a medium bowl and set aside.

Step 4

Mix the butter and sugar in a separate bowl until light and fluffy. Beat in the vanilla.

Step 5

Set the mixture on low and slowly add the flour mixture. Mix until just combined.

Step 6

Set aside about 3/4 cup of the dough. Firmly press the remaining into the prepared pan and then evenly spread the plum mixture over the crust. Crumble the reserved dough over plums.

Step 7

Bake for about 45 to 50 minutes or until the top is golden and the filling is bubbling.

Step 8

Transfer the pan to a wire rack and cool completely.

Step 9

Grab the ends of the parchment paper and take the crumble out of the pan. Slice into 16 bars. Serve.