Pour oil into a frying pan and heat it up to medium high. While it's getting warmed up cut the chicken breast into cubes or stripes depending on our favorite shape. Place the chicken breast onto the hot oil/butter then season it with salt and pepper. Cook it until the bottom gets a golden brown color for about 5-10 minutes. Turn the pieces of chicken upside down and cook it until that side also gets a slight golden brown color for about 5 more minutes. Add the broccoli florets and stir fry until the broccoli starts to loose up it's firmness for about 5 more minutes. Broccoli can be frozen or fresh but keep in mind that frozen broccoli requiresu00a0 longer cooking time about 10 minutes. Add the butter reduce heat to medium and let it melt around the broccoli and meat. Add a bit of water 1/4 cup should be enough. Add grated Parmesan cheese an let it melt while stirring it slowly. When we achieved the desired sauce thickness remove frying pan from heat. As it cools down the sauce gets thicker so serve it as soon as it's ready.