1tspcoarse Kosher salt(if using table salt, use half the amount)
1tspbaking powder
1tspground cinnamon
1cup (2 sticks)cold, unsalted butter,diced
Filling
12ozrhubarb, diced into 1/4 - 1/2 inch cubes(about 2 1/2 cups diced)
¼tspbaking soda
½cupgranulated sugar
¼cupall-purpose flour,spooned and leveled
½cupstrawberry jam or preserves
1tbsplemon juice
1tspvanilla extract
Instructions
Preheat the oven to 350. Spray a square 8×8 baking dish with non-stick spray.
In your food processor, or with a pastry cutter, combine the crust/topping ingredients until pea-sized pieces of butter remain.
Reserve 1 ½ cups of the crumbs for the topping (chill in the refrigerator until needed), and press the remainder of the crumbs firmly against the bottom of the baking dish. Bake crust for 20 minutes.
Meanwhile, in a bowl toss the rhubarb with the baking soda, sugar and flour until all the fruit is coated. Stir in the jam, lemon juice and vanilla.
Spread the rhubarb mixture over the hot crust. Bake for 30 minutes.
Sprinkle the reserved crumbs over the fruit and bake for an additional 20-25 minutes until topping is golden brown.
Let cool on the counter for at least two hours to set before slicing into squares.
Notes
These can be served slightly warm or room temperature, and are wonderful with ice cream. These bars are best eaten within 1-2 days.