Preheat oven to 350°F. Place a piece of parchment on a sheet pan and brush with olive oil. *(If you do not have parchment, make sure the pan is well-greased with shortening or butter, or prepared with non-stick baking spray.)
Work with half of the dough at a time. Roll the dough out on a floured surface in the shape of a rectangle, 6” x 18”, keeping the thickness to approx. 1/4”. *(the burgers are 3” squares, so you should get approximately 12 from each half of dough).
Measure out 3” x 3” squares and cut.
To each square add 2 Tbsp of filling in the middle. With one hand take the bottom left corner of the square, with the other hand grab the top right corner and meet them in the center above the filling. Pinch the corners together. Repeat with the lower right corner and upper left corner. Then, pinch the seams together to securely close the bundle.
Turn over and place on the parchment covered sheet pan, leaving about 2” between each burger. Fill the sheet pan and place in the oven. While the first batch is baking, repeat the process with the other half of the dough for the second batch.
Bake for 25-30 minutes, until lightly browned on the bottom and top. Remove from the oven and brush with melted butter.
Enjoy on its own, or serve with dill pickles, pickled veggies, crudités, and your favorite mustard for a lunch, or as part of a buffet.