Step 1: Preheat the oven
Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper if desired.
Step 2: Make the garlic-herb butter
In a small bowl, mix the softened butter, garlic powder, dried oregano, and optional parsley until evenly combined.
Step 3: Slice the rolls into three layers
Separate the rolls if they are attached. Using a serrated knife, carefully slice each roll horizontally into three bread layers: a bottom, a middle, and a top. This creates two spaces for cheese in each slider.
Keep the layers from each roll together so they are easy to reassemble.
Step 4: Butter the bread
Spread the garlic-herb butter over the cut surfaces of the bread. Divide it as evenly as possible among all 12 rolls.
Step 5: Add the cheddar
Cut or tear the cheddar slices into pieces that fit the rolls. Place cheese between the bottom and middle layers, then add more cheese between the middle and top layers.
Divide the 8–10 slices among the 12 sliders, using additional cheese if you prefer them extra cheesy.
Step 6: Arrange on the baking sheet
Reassemble the sliders and place them on the prepared baking sheet. Keep a little space between them so the sides can brown.
Step 7: Bake and flip
Bake for 20–25 minutes, carefully flipping the sliders halfway through, until the bread is golden and the cheddar is melted.
Use a thin spatula to turn each slider gently. If a little cheese escapes, tuck it back in before returning the sliders to the oven.
Step 8: Serve warm
Let the Hawaiian Roll Grilled Cheese Sliders cool for a minute or two, then serve while the cheese is warm and melty. Pair with tomato soup, marinara, or your favorite dip.