Dice the chicken breast into an inch diameter
Fry the meat in a skillet for about 5 minutes, always stirring
Pour half a cup of white wine and let cook until it evaporates
Set the meat aside in a bowl
Peel and finely chop the onion and the garlic cloves
Melt the butter in a skillet over medium heat and add in the minced onion and garlic. Saute for about 2 minutes
Thinly slice the lemon half and add it to the buttery onion and garlic. Stir and let it cook for about 1 minute
Pour in the heavy cream and season with salt and pepper, cook for 1-2 minutes
Add the spinach leaves and mix, then turn off the stove
Cook the pasta al dente according to package instructions
Do not drain the water, instead, use a pasta spoon or tongs to transfer the pasta directly to the skillet with the sauce
Mix well, use some pasta water if too dry
Serve the pasta immediately and add a pinch of lemon zest on top of the dish