Season chicken thighs on both sides with salt and black pepper.
Heat olive oil in a large skillet over medium-high heat.
Add chicken to the skillet and sear for 6 to 8 minutes per side until the internal temperature reaches 165°F (74°C).
Remove chicken from the skillet and transfer to a plate, leaving any residual oil in the pan.
Reduce heat to medium and melt the butter in the skillet.
Add minced garlic and sauté for 1 minute until fragrant, ensuring it does not burn.
Stir in the chicken broth, lemon juice, and dried oregano, scraping the bottom of the skillet to release browned bits.
Simmer the sauce for 3 minutes to slightly thicken the liquid.
Return the chicken to the skillet and baste with the garlic butter sauce for 1 to 2 minutes.
Garnish with fresh parsley and serve immediately.