Preheat your griddle or griddle-style grill burner to low, about 300°F (150°C).

Split the 4 hamburger buns in half horizontally so you have 8 halves.

Arrange the bun halves cut-side down on the preheated griddle. If a section of the griddle already has cooking residue or flavor from previous cooking (onions, peppers, etc.), you may place the buns there.

If you want the insides to steam a bit as they toast, cover the buns with a dome or metal bowl (optional).

Toast the buns until the cut sides are golden and warmed through, checking frequently. This should take just a few minutes (roughly 2–4 minutes depending on your griddle and heat).

If you also want the outside of the buns toasted, flip each bun and toast the outside briefly (about 30–60 seconds) until lightly browned.

Remove the buns from the griddle and serve immediately.