“Mazurka is a traditional Polish dessert made for special occasions. Delicate, buttery, strudel-like layers surround a velvety, blueberry filling for a decadent treat you won’t forget.” - Cara Ferguson of Culinary Cara
Combine blueberry filling ingredients in a medium saucepan and place over medium heat. Stir filling until you see it thicken and bubble, about 8-10 minutes.
Remove from heat and allow to cool completely before assembling dessert.
Preheat oven to 325°F.
Mix pastry ingredients together in a large bowl until most of the butter is incorporated and creates a crumbly, strudel-like texture (make sure not to let the butter melt).
Prepare an 8x8 inch brownie pan by lining with foil or parchment paper, and grease with butter or nonstick spray. Pack half of the pastry mixture onto the bottom of the pan and spread blueberry filling over the bottom layer.
Sprinkle remaining half of pastry over blueberry filling and very gently pack down, making sure not to let any filling seep to the surface. Bake for 1 hour.
Allow dessert to cool before lifting out of pan, and cut into 16 bars.