Prepare the Mushrooms: Gently wipe the mushrooms clean with a damp paper towel or a mushroom brush.
Slice them to your desired thickness.
Heat the Pan: Place a frying pan or skillet over medium heat and add the olive oil.
First Sauté: Arrange the mushroom slices in a single layer in the hot pan.
Let them cook without stirring for 3-5 minutes, until they have absorbed the oil and started to brown on one side.
Spice and Finish: Sprinkle the chili powder over the mushrooms and stir to coat. Increase the heat to medium-high and continue to cook, stirring frequently, for another 2-3 minutes until they are beautifully browned and tender.
Serve: Remove from heat, season with salt and pepper if desired, and serve immediately.
Don't crowd the pan. Give the mushrooms plenty of space in a single layer to ensure they sauté and brown rather than steam.
Cook in batches if necessary.