Pat chicken thighs dry, season with salt and pepper, and sear in 2 tablespoons butter over medium-high heat for 5 minutes per side; transfer to a plate.
In the same skillet, add remaining butter and sliced mushrooms, sautéing for 3 minutes until golden.
Add minced garlic and cook for 30 seconds, then pour in cream and stir in mustard until smooth.
Return chicken to the skillet, reduce heat to low, and simmer for 5 minutes until chicken is cooked through.
Divide chicken and creamy mushroom sauce among four plates.
Photo: Ben Lei / Unsplash