Preheat your oven to 375°F.
Season the chicken thighs with salt and pepper on both sides.
Heat the olive oil in a Dutch oven over medium-high heat.
Add the chicken thighs to the pot and cook until browned on both sides, about 3-4 minutes per side.
Remove the chicken from the pot and set it aside.
Add the minced garlic to the pot and cook for 1 minute until fragrant.
Add the chicken broth to the pot and scrape the bottom of the pot to release any browned bits.
Whisk in the flour until smooth.
Add the butter, lemon juice, and sage to the pot, stirring until the butter has melted and the sauce is well combined.
Return the chicken thighs to the pot, skin side up, and spoon the sauce over the top.
Cover the Dutch oven with a lid and bake the chicken in the preheated oven for 30-35 minutes or until the internal temperature of the chicken reaches 165°F.
Remove the chicken from the oven and let it rest for a few minutes before serving.