Prepare all the ingredients, keeping them separate from one another.
Heat a large skillet or saute pan over high heat. When the pan is hot, add in some of the cooking fat. Add in the onions with a pinch of salt and cook for 2-3 minutes, stirring occasionally. Reduce the heat to medium-high and add in the shallots. If the pan needs more cooking fat, add more. Cook for 2 minutes and add in the garlic. Stir for 1 minute to prevent the garlic from burning. Remove the mixture from the pan and set aside.
Add 2-3 tablespoon of the cooking fat to the hot pan over high heat. Add the chicken cutlets and cook for 2-3 minutes, depending on the thickness of the cut. Flip and continue cooking until cooked through. Remove and set aside.
Add in the remaining cooking fat and the zucchini. Sprinkle with salt and pepper. Cook for 2 minutes and flip. Cook until tender and remove from the pan.
Plate the zucchini first, with some of the onion mixture on top. Lay a chicken cutlet on the zucchini and onions. Add a touch more of the onion mixture onto the chicken cutlet. Shred fresh parmesan and add some chopped parsley. If you would like, drizzle with some Lemon Olive Oil.
Serve hot and happy eating.