Set the oven to 350 degrees
Pit and slice plums, then put them in a medium bowl.
Add sugar, lemon juice, ground cinnamon, and salt to the bowl and mix.
Set aside.
Meanwhile, in a medium bowl, mix together the flour, butter, and powdered sugar. The dough should form a shortbread-like consistency.
Reserve ½ cup of the crust mixture for the topping.
Once those ingredients are well mixed, press the dough into a 9-inch pan. Bake for about 10-12 minutes, or until the sides are slightly browned.
After the crust has cooked, remove it from the oven and carefully add your plum mixture. Spread it evenly.
Bake the crust with the plums for about 35-40 minutes, or until the sides are slightly browned.
When the plum bars are finished, cool them on a wire rack.
Once cooled, cut the bars into squares.
Refrigerate until chilled, or enjoy them slightly warm.
