Preheat oven to 375 degrees

Combine flour, sugar, rosemary, and dried cranberries in a large bowl

Use a pastry blender (or 2 knives) to work butter into flour mixture

Continue to work the butter into the flour until it resembles coarse meal

Press flour-butter mixture in to 9 x 13 inch baking dish

Bake at 375 degrees for approximately 25 minutes, or until top of shortbread turns light, golden brown

Remove from oven and cool

Once shortbread is cool, sprinkle with confectioner's sugar and cut into small squares

Enjoy!