Heat a large skillet over medium heat. Add butter and olive oil, allowing it to melt and mix together.
Once melted, add the thinly sliced shallots and cook for 1-2 minutes until they are soft.
Add the mushrooms to the skillet, making sure they are in a single layer. Cook for about 10 minutes, stirring occasionally, until they are golden brown and tender.
Season with salt and pepper to taste.
Add lemon juice, dry sherry, and fresh thyme to the skillet. Stir everything together and cook for an additional 3-4 minutes until the liquid has reduced slightly.
Remove from heat and garnish with chopped parsley.
Serve hot as a side dish or appetizer alongside your favorite protein.
Notes
Make sure to use a large enough skillet so that the mushrooms are in a single layer. This will ensure they cook evenly and get golden brown.
Don’t overcrowd the skillet, or else the mushrooms will steam instead of getting nicely caramelized.
Use fresh herbs for the best flavor.
If you prefer a creamier sauce, you can add a splash of heavy cream at the end and let it simmer for a few minutes.