Prepare the quinoa according to the package. Add a bouillon cube to the water before you mix them. (I used 1 part of quinoa and 3 part of the water)
While it's getting puffed up, make the sauce.
Melt the butter in a saucepan over low heat.
While it's melting, dice the onion and crush the garlic with a garlic press.
Add the onion and the garlic to the melting butter. Let them soften over medium heat. (Be careful, the garlic burns quickly)
In the meanwhile, slice the chicken breasts and halve the small button mushrooms.
Add the seasoning to the butter, if the onion softened enough, add the chicken slices and the halved mushrooms.
Stir it until most of the chicken slices turns white.
Sprinkle the flour on the chicken and mix them well.
Pour the milk over, mix it. (The chicken slices may make it a little harder, but it's easier if you push them away and mix the milk in between the slices)
Let it cook for about 10-15 minutes (depends on the size of your slices, but to be sure, cut a bigger slice in the middle and see if no pink part left in).
Pour the quinoa into a plate and top it with the sauce, serve it hot.