Step 1Scrub potatoes under cold running water. Pat dry with paper towels. Make 3 or 4 crosswise slits in each potato, but not through, so potato remains intact. Break off tips of herb sprigs and gently insert pieces into potato slits. (Potatoes are best when you use 1 herb for each potato, rather than mixing them.)
Step 2Place potatoes on jellyroll pan or in baking dish sprayed with nonstick cooking spray. Lightly spray potatoes. Spoon a little butter into cuts of each potato. Sprinkle potatoes with salt and pepper.
Step 3Bake at 400 degrees until potatoes are fork tender, about 45 minutes, stirring several times during roasting.