Clean and slice the mushrooms. Wash the jalapeños, remove the stems and seeds (if you prefer a milder sauce), then finely chop them. Peel and finely chop the garlic and onion.
In a large skillet, heat the olive oil and butter over medium heat. Add the chopped onion and sauté until translucent, about 2-3 minutes.
Add the garlic and chopped jalapeños and cook for another 1-2 minutes, until fragrant.
Add the sliced mushrooms and cook for 5-7 minutes, until they release their liquid and soften.
Pour in the heavy cream, stir to combine, and let the sauce simmer over low heat for 5-7 minutes, until it thickens.
Season with salt and pepper, then remove from the heat. Stir in the finely chopped fresh parsley.
Serve immediately with grilled meats, pasta, or roasted vegetables. It can be stored in the refrigerator for up to 2 days.
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