Prepare the vegetables by finely dicing the yellow onion, mincing the garlic cloves, and chopping the zucchini into bite-sized half-moons.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Add the diced onion to the skillet and sauté for 3-4 minutes until translucent and soft.
Add the ground veal to the skillet, breaking it up with a wooden spoon or spatula. Cook until the meat is browned and no longer pink.
Stir in the minced garlic, dried oregano, sea salt, and black pepper, cooking for 1 minute until the spices are fragrant.
Add the chopped zucchini to the skillet and toss to combine with the meat and aromatics.
Cover the skillet and cook for 5-7 minutes, or until the zucchini is tender but still holds its shape.
Remove the skillet from the heat and sprinkle the grated parmesan cheese evenly over the top.
Allow the cheese to melt slightly before serving directly from the skillet.