Arrange a rack in the middle of the oven and heat to 425°F.
Place the melted butter, Cajun seasoning, and salt in a small bowl and stir until completely combined.
Pat the chicken dry with paper towels.
Place the chicken in a 9x13-inch baking dish, spaced slightly apart.
Brush the chicken all over with the spiced-butter mixture.
Bake until the chicken is golden-brown, cooked through, and registers 165°F on an instant read thermometer, 25 to 35 minutes depending on the size of the chicken (start checking at 20 minutes).
