Preheat oven to 350°F. Spray large cookie sheet with cooking spray or line with parchment paper. In small bowl, mix cream cheese, granulated sugar, lemon juice and lemon peel with electric mixer on medium speed until well blended.: You will notice a warm, bakery like scent almost immediately once the oven hits temperature, which helps set expectations. Preheating ensures the dough begins to bake and rise instantly, creating flaky layers rather than a slow dense bake. If you skip full preheating, the dough may absorb more butter and become dense, so wait until the oven reaches the set heat. A common mistake is placing the ring in too cool an oven which stretches baking time and affects color development. Make sure your oven rack is centered for even heat and the cookie sheet is dry so it won’t steam the bottom of the dough.
Unroll dough sheet. (If using crescent rolls, unroll dough and separate into 2 large rectangles. Overlap long sides to form 13 x 7-inch rectangle; firmly press edges and perforations to seal.) Spread cream cheese mixture on rectangle to within 1/2 inch of edges. Sprinkle evenly with blueberries.: At this stage you will experience a creamy, smooth texture and the citrus aroma will become pronounced as oils from the zest release. Blending on medium speed yields an evenly textured filling without over aerating it, which keeps the filling stable. If the cream cheese is too cold it may not combine smoothly, producing small lumps, so soften it properly ahead of time. Avoid over mixing which can make the filling too fluffy and difficult to spread, and scrape the sides of the bowl to ensure no pockets of unmixed sugar remain.
Starting with 1 long side of rectangle, roll up the dough tightly and pinch the edge to seal. Some of the filling will leak out during baking but that's okay!: The dough should look glossy and slightly tacky, and pressing seams together prevents the filling from leaking excessively. Working on a lightly floured surface prevents sticking, and taking a moment to line up edges gives the ring a neater appearance. A frequent oversight is not sealing perforations well enough, which results in escaping filling and irregular shape. Handle the dough gently to preserve its layered structure, and if it feels too warm let it rest in the fridge briefly to firm up.
With a serrated knife, cut into 12 slices. My cream cheese was overly soft so cutting it was tricky. Don't worry if it's messy. When it bakes it will take care of any issues.: The spread should be smooth and even, with the lemon fragrance wafting as you work. Leaving a 1/2 inch border helps the dough seal cleanly and prevents excessive leakage. Distribute the blueberry evenly so every slice has fruit, but avoid piling them in one spot to prevent sogginess. For frozen berries, pat excess frost away to reduce extra moisture. A common mistake is overfilling which causes large leaks during baking, so err on the side of a modest amount of filling.
Arrange slices on cookie sheet in a circle, overlapping slightly.: Rolling tightly creates firm spirals so the ring holds together and slices neatly later. As you roll you will feel resistance from the filling, and that gentle pressure is what gives the ring its lovely swirl. Pinching the edge ensures the seam will not unroll during baking. Some filling will escape and form caramelized bits on the pan, which adds flavor, so don’t panic if you see leaks. A mistake to avoid is rolling too loosely because it results in a sloppy shape that separates when sliced.
Bake 15 to 20 minutes or until golden brown.: Use a gentle sawing motion with a serrated knife to keep the spirals intact; the slices should reveal a clear swirl. If the filling is overly soft, chill the roll briefly for easier cutting, but be careful not to harden the dough. Expect some messiness, as described earlier, but the visual impact after baking is forgiving. A common error is pressing down too hard which compresses the layers, so make clean, confident cuts.
In small bowl, mix the glaze ingredients until thin enough to drizzle. Drizzle over warm crescent ring. Serve warm or room temperature.: When arranged in a circle, the slices will bake into a cohesive ring with attractive edges. Overlapping slightly encourages the slices to support each other so the ring holds its shape. You will see juices and bits of filling between slices, which caramelize and add crisp, flavorful edges. Avoid spacing them too far apart, which can break the ring during baking, and resist nudging them after they start to firm in the oven.
Bake 15 to 20 minutes or until golden brown.: As it bakes you will notice the dough inflating slightly and turning a deep golden color, and the filling will bubble here and there in glossy pools. The color is your best indicator of doneness more than strictly timing, though 15 to 20 minutes is a reliable window. If you under bake it, the dough will be pale and doughy, while over baking dries it out, so watch the edges carefully in the last minutes. An easy mistake is relying solely on time, so check for a consistent golden hue and a set filling before removing.
In small bowl, mix the glaze ingredients until thin enough to drizzle. Drizzle over warm crescent ring. Serve warm or room temperature.: The glaze should run smoothly off a spoon in a slow ribbon, clinging to the warm pastry and highlighting the curves. Drizzling warm helps it set slightly into a glossy coat. If the glaze is too thick, it will sit on top and look heavy, so thin with a little more milk until it drips but still coats the surface. Serving warm elevates the aroma and texture, but at room temperature the ring still shines. A mistake to avoid is adding too much milk which makes the glaze runny and causes it to pool on the plate rather than accent the ring.