Wash and pat dry the mushrooms.
Slice the mushrooms into 1/4 inch thick slices.
Line a cookie sheet or tray with paper towels.
Place the mushroom slices, in a single layer, onto the paper towel lined tray.
Lightly sprinkle the mushroom slices with salt. This will render the water out of the them.
Allow the mushrooms to sit for approximately 5 minutes.
While the mushrooms are resting, prepare the persillade mixture.
Finely chop the parsley and garlic, and mix together.
At the end of 5 minutes, pat the mushrooms dry with a paper towel.
Place the olive oil into a skillet, and heat over medium high heat.
Once the oil is heated, place the mushrooms into the skillet.
Allow the mushrooms to fry, stirring occasionally.
Fry the mushrooms for about 10 minutes, or until they are light golden brown in color.
Remove the mushrooms from the oil, using a slotted spoon.
Immediately mix in 2-3 tablespoons of the persillade mixture. Add salt and pepper to taste.