Heat plenty of water in a large saucepan. When the water boils, put in the tagliatelle and add a little salt. Follow the instructions on the package for boiling the tagliatelle and once they are ready, drain them well. Mix the tagliatelle with a few drops of olive oil so that they do not stick together and leave them aside.
Sauté the onion and garlic in olive oil for a few minutes. When the onion becomes transparent, add the mushrooms and cook for about 10-15 minutes. When the mushrooms are cooked, remove the olive oil from the pan and add the boiled tagliatelle. Mix well to incorporate all ingredients.
In a grinder, grind together the almonds, the onion powder, the garlic powder and a pinch of salt. Sprinkle the tagliatelle with this mixture and serve while hot!