In a pot, boil 1.5 liters of water to which you previously added a pinch of salt and 1 tbsp of olive oil
Cut the chicken breast in small dices
Slice the mushroom
Cut the onion in small pieces
In a pan, put add the butter and start cooking the onion pieces
As soon as the onion pieces start softening, add the chicken dices and cook them
Once the chicken is cooked, add the smashed clove of garlic and the slices mushrooms, and frequently stir until the mushrooms are cooked
At this point, the water must have reached its boiling point. Pour the 250 g of Fettuccine pasta in the boiling water for about 8-10 mins, depending on how firm or soft you like your pasta
In the meantime, while the pasta is being cooked, add to your pan (on medium heat), the 500 mL of cooking cream
Then, add salt, thyme and pepper to the cream and stir from time to time until it starts boiling
Now, if the cream starts boiling before the pasta is done you can turn off the heat from under the pan
Once the pasta is cooked, pour them through a colander to remove the water, put them back into the pot and add to it all the ingredients from the pan
Add your shredded parmesan cheese
On low heat, stir frequently the whole mixture for a couple of minutes
Your food is ready, enjoy!