Preheat oven to 375 degrees Fahrenheit. Spray 8 cavities in a muffin pan well with non-stick cooking spray and set aside.
On a clean surface, unroll the crescent roll dough into a rectangle (if not using seamless, make sure to press the seams together). Spread the Tablespoon of softened butter evenly over the dough, then sprinkle the sugar and lemon zest over the dough. Evenly distribute the blueberries on top.
Starting with the long side, tightly roll the dough up. Using unwaxed, unflavored dental floss or a sharp knife, cut the roll into 8 equal pieces.
Place each piece into the prepared muffin cavities. Bake at 375 degrees Fahrenheit for 12 to 15 minutes or until lightly golden brown.
Remove from the oven and allow to cool in the pan for about 10 minutes.