Heat a skillet over medium-high. Add olive oil and swirl. When it glistens, toss in mushrooms. Sauté until they’re deeply browned and their edges look like tiny caramel souvenirs.
Add shallot and garlic. Stir 1–2 minutes until fragrant. If you can smell sunshine, you’re on the right track.
Pour in broth and bring to a simmer. Let it reduce by about half; you want COZY, not soupy.
Stir in cream, soy sauce, Dijon, and thyme. Reduce heat to low and simmer gently until the sauce thickens to a silky coat. If it’s too thick, splash in a bit more broth.
Season with salt, pepper, and a squeeze of lemon if you’re feeling zesty. Taste and adjust—the hero shot should be perfectly balanced.
Pour over your cooked steak or use as a dip for your mashed potatoes. Garnish with parsley and serve hot.