Mix the olive oil, thyme, garlic powder, onion powder, salt, and pepper together in a bowl. Slice or butterfly the chicken breasts so they're an even thickness throughout. Toss the chicken in the seasoned oil until every piece is well coated on all sides.
Heat your skillet over medium-high heat until it's properly hot before adding the chicken. Let each side sear undisturbed for a few minutes so you get color instead of steaming the meat. Check the internal temperature and pull the chicken once it reaches 165°F, then set it aside on a plate.
Lower the heat slightly and pour the chicken broth into the same skillet to deglaze the pan. Add the butter and let it melt slowly, stirring so it blends smoothly with the broth. Once melted, stir in the minced garlic and dried parsley and sauté until fragrant.
Return the seared chicken to the skillet and turn each piece so it's fully coated in that glossy garlic butter sauce. Let it sit in the sauce for a minute so the flavor really soaks in. Plate the chicken and spoon any extra sauce from the pan right over the top.