Bring a large pot of water to a boil over high heat to cook the gnocchi. Once boiling, add some salt and the gnocchi, and cook according to package directions.
While the water is coming up to a boil, place a medium-size skillet with EVOO over medium-high heat. Add the butter and EVOO to the skillet and heat up for 2 minutes, until just barely smoking. Add the sirloin and brown until nice and caramelized. While the meat is browning, use the back of a wooden spoon to break it up into bite-size pieces that measure up to the size of the gnocchi.
Once the meat has started to brown evenly, add the onion and garlic to the pan and cook for about 4-5 minutes, shaking the skillet every now and then for even cooking.