Preheat your oven to 375°F (190°C). Grease a mini muffin tin or line with paper cups.
Separate each biscuit and cut into quarters. Flatten each piece with your fingers.
Place about half a teaspoon of Nutella in the center of each flattened piece.
Fold the dough around the Nutella, pinching to seal it well. Roll gently into a ball.
Place each ball into the muffin tin slot. Bake for 12–15 minutes or until golden brown.
While they bake, mix the cinnamon and sugar in a small bowl.
When the bites come out of the oven, brush them with melted butter.
Roll the warm bites in cinnamon sugar and sprinkle with chopped nuts if using.
Let cool slightly (but not too much—these are best warm and gooey).