Preparation

1. In a large bowl, sift together the flour, baking soda, cinnamon, and salt. In the bowl of a heavy-duty mixer with a paddle attachment, beat the butter and brown sugar until light and fluffy. Beat in the egg, egg yolk, and vanilla. With the mixer at low speed, gradually add the flour mixture into the butter mixture until combined. Remove the dough from the bowl and shape into a rectangle. Wrap in plastic wrap and refrigerate 1 hour or overnight.
2. Preheat the oven to 350 degrees. Line 2 large baking sheets with parchment paper or use nonstick baking sheets. On a lightly floured surface, roll dough into a 24 x 6-inch rectangle. Place a heaping ½ inch rope of Oil & Vinegar Orange Spread down the center of the rectangle. Fold each long side of the rectangle toward the center of the strip of filling, so that the sides overlap slightly. Cut the dough crosswise into two 12 inch logs; refrigerate 15 minutes or overnight.
3. In a small bowl, beat together the egg and the milk. Transfer each log, seam-side down, to a cutting board. Brush with the egg glaze, then sprinkle with the crystal sugar. Cut each log into twelve 1-inch-thick slices; place, 2 inches apart, on the prepared baking sheets. Bake 15 to 20 minutes, rotating the baking sheets between the upper and lower oven racks halfway through baking, until golden brown. Transfer the bars to wire racks to cool completely.