Can I make these sliders ahead of time?
Yes. Form and assemble the sliders up to 24 hours ahead, cover with plastic wrap, and refrigerate. Bake from cold, adding 2-3 minutes to bake time.
Do I need to thaw the frozen onion rings?
No, use them straight from frozen. Place one on top of each slider before baking; they'll crisp up in the oven.
What can I substitute for American cheese?
Cheddar, Swiss, or pepper jack work well. You can also use a 1:1 mix of American and cheddar for more flavor.
How many sliders does this recipe make?
This recipe makes 12 sliders (one per Hawaiian roll in a standard 12-count package).
Can I use fresh onion rings instead of frozen?
Fresh onion rings may brown too quickly in the oven. Frozen rings are designed to bake and crisp evenly without burning the roll.