Preheat oven to 400 degrees F. Sprinkle chicken breasts with 1 teaspoon all purpose seasoning on both sides.
Preheat large cast iron skillet on medium-high heat and add olive oil. Sear chicken breasts for 2 minutes per side or until browned. Remove from heat.
In a small bowl, melt butter and add garlic and remaining 2 teaspoons of all purpose seasoning. Stir well and pour over chicken breasts.
Bake chicken breasts for 25 minutes (under 2" thick) to 3o-35 minutes (over 2" thick) or until instant meat thermometer inserted in the thickest part reads 165 degrees F.
Remove chicken breasts from the oven, cover with foil, and let rest for 5 minutes for the juices to settle (don't skip!). Slice against the grain and serve warm.
Notes
Store: Refrigerate in an airtight container for up to 5 days.
Freeze: Freeze in an airtight container for up to 3 months.
If you don't have cast iron skillet: Sear chicken breasts in a regular pan, then transfer to an ovenproof baking dish and bake as per recipe.
Choose similar size chicken breasts: I used 4 large organic breasts that were the same in size. If you bake 5 oz chicken breast at same time as 9 oz chicken breast, I can guarantee you the smaller piece will come out rubbery and dry by the time larger one is ready.
Don't skip letting your meat rest - this ensures the chicken juices settle back into the chicken which results in the tender, juicy chicken you want.