Prepare the chiles Remove the stems and seeds from the guajillo chiles. Cut them into small pieces.
Slice the garlic Cut the garlic cloves into thin slices.
Clean the mushrooms You can wipe them with a damp cloth or rinse them quickly (I rinse mine too—don’t worry ).
Cut the mushrooms Slice them into 2–3 pieces, or leave them whole if serving as an appetizer.
Heat the fats In a large skillet, melt the butter together with the oil.
Sauté the garlic and chiles Add the garlic and cook until fragrant (don’t let it burn). Add the guajillo chile and cook until the oil turns a reddish color.
Add the mushrooms Sauté for 1–2 minutes.
Cover and cook Cover and cook for 4 minutes, stirring halfway through.
Uncover and finish cooking Cook for another 2 minutes until soft and juicy.