Preheat the oven to 350 degrees F (175 degrees C).

Combine Italian seasoning, garlic powder, seasoning salt, mustard powder, and black pepper in a bowl; set aside.

Remove giblets from chicken cavity; rinse chicken thoroughly. Place chicken in a 9x13-inch baking dish. Sprinkle 1 ½ teaspoons spice mixture in chicken cavity; rub remaining spice mixture on outside of chicken.

Combine lemon juice and olive oil in a small bowl; drizzle over chicken.

Bake in the preheated oven until the juices run clear, about 1 ½ hours, basting several times with remaining lemon-oil mixture. An instant-read thermometer inserted into the thickest part of the thigh, near but not touching the bone, should read at least 165 degrees F (74 degrees C).