Is this a first?

I made muffins this morning. They were from a mix. Just add milk, stir and pour into muffin tins. I make muffins with semi-frequency and the one thing I hate is filling up the muffin cups. It’s just a pain. Did I put enough in? Am I dripping all over the place? Are they even? blah blah blah. So this morning instead of placing the mix and milk into a bowl, I put it in a ziplock plastic bag. I squeezed and kneaded the batter and then when it was ready, I cut off the corner and filled up the cups by squeezing the bag like it was a pastry bag. And can I tell you there was barely any clean up? Perhaps this is a known shortcut, I have no clue, but I still feel a need to put it out there for other muffin makers who may not be in the know.