Preheat oven to 350 degrees.Working in batches, sear chicken thighs on both sides in olive oil over high heat (don’t cook through). Season with salt and pepper. Set aside. In a medium sized Dutch oven, lightly sauté onions and mushrooms in olive oil over medium heat. Turn off heat and add flour. Using a wooden spoon, stir to incorporate the flour into the mushroom mix.Lay chicken thighs on top of mushroom mix. Pour the bottle of miso gravy over top and bake in oven for 35-40 minutes, stirring once halfway through. Enjoy!