chicken thighs, skin-on and bone-in • kosher salt • black pepper • / 60g unsalted butter • / 10oz white mushrooms, halved if small, or cut in 4 to 6 if large • medium brown onions, sliced 0.6 cm (1/2in) wide • garlic cloves, finely minced • bay leaf • thyme sprigs (or 1/2 tsp dried thyme) • flour, plain / all-purpose • white wine, preferably chardonnay • chicken stock, low sodium •