Preheat the oven to 400 degrees F.
In a large, oven-safe pan over medium heat, heat 1 tablespoon of the olive oil.
Season the chicken thighs on both sides with the salt and the pepper.
Place the chicken thighs, skin-side down, in the hot oil in a single layer and cook until they are golden-brown, about 4-5 minutes per side. The chicken will not be cooked through yet.
Transfer the chicken thighs to a plate and cover to keep them warm.
In the same pan over medium heat, add the remaining olive oil.
Add the potatoes to the hot oil and season with the salt and the pepper.
Cook until the potatoes are golden-brown, about 3-4 minutes per side.
Transfer the potatoes to a separate, clean plate and cover to keep them warm.
In the same pan over medium heat, melt the butter.
Add the onion to the melted butter and cook until softened, about 4-5 minutes.
Add the garlic and cook until fragrant, about 30 seconds.
Add the Italian seasoning and cook until just fragrant, about 20 seconds.
Add the wine to the onion mixture and bring it to a simmer.
Cook until the wine has been reduced by half, about 2-3 minutes.
Add the chicken broth and stir to combine.
Season the sauce mixture with the salt and the pepper.
Add the chicken and the potatoes to the pan, making sure the chicken thighs are skin-side up.
Bake the chicken mixture until the chicken thighs reach an internal temperature of 165 degrees F, about 30 minutes.
Switch the oven to broil and broil the chicken mixture until the chicken skins are crispy, about 2-3 minutes.
Transfer the pan from the oven and stir in the peas.
Drizzle the lemon juice over the chicken mixture.
Sprinkle the chicken mixture with the parsley.
Serve immediately with the pan juice spooned over the top of the chicken mixture, garnished with the lemon slices.