[When Akko opens the door, she's holding a plate with a perfectly normal (if a tad bit dark) grilled cheese sandwich. It definitely does not look as burnt as it smells.]

Ah, eheh...oops. I probably should have opened a window, huh...

[She ducks back into her room to set the plate down before popping back out to head for the window on the other side of the common room.]

I'm sorry I woke you up! It's crazy you could smell it in your sleep, though. You must have a great sense of smell!