Preheat the oven to 350 degrees Fahrenheit. Grease a 12 cup muffin tray with cooking spray and set aside.
On a lightly floured surface, roll each tube of crescent roll dough into a larger rectangle, making sure the perforations are stuck back together so they don’t open up while baking.
Spread ¼ cup of blueberry preserves evenly over one of the dough rectangles. Layer another dough rectangle on top and spread another ¼ cup of blueberry preserves on top. Top with the final dough rectangle and spread the remaining blueberry preserves on top. Sprinkle the blueberries evenly over the preserves.
Starting from the longer edge, roll the rectangle up tightly into a log shape. (See pictures if you need a visual!)
Slice the log into 12 equal rounds, and place those into the prepared muffin tin.
Brush each cruffin with a generous amount of melted butter.
Bake in the preheated oven for 18-20 minutes, or until golden brown and cooked through.