Aunt Denise makes these when the fridge is bare but everyone still wants something hot, cheesy, and dunkable.

Place the casserole dishes on the middle rack of the preheated oven. Bake for 10–15 minutes, until the cheese is melted, bubbling, and just starting to turn golden at the edges. The romaine will soften slightly but should still hold its shape.
For a deeper cheesy crust, switch the oven to broil for 1–2 minutes, watching closely so the Parmesan browns but does not burn.
Remove the dishes from the oven and let the sandwiches cool for 3–5 minutes—they’ll be very hot and easier to pick up once they set slightly. Serve straight from the casserole dishes with extra Caesar dressing on the side for dunking, and eat with your hands like warm, low-carb chicken Caesar subs.
Variations & Tips
If your fridge is truly bare, this recipe is very forgiving. Swap in any cooked chicken you have (poached, grilled, or leftover roast) and simply season more assertively with Caesar dressing, salt, and pepper. For a richer version, add a tablespoon of mayonnaise or sour cream to the chicken mixture to make it creamier. If you prefer more crunch, tuck a few raw celery sticks or thinly sliced bell peppers underneath the chicken in each romaine leaf before baking; they’ll soften slightly but still add texture. You can also trade romaine for sturdy butter lettuce or even Napa cabbage leaves, though romaine holds up best to the oven. To stretch the dish for more people, stir a handful of chopped leftover vegetables—like roasted broccoli, cauliflower, or zucchini—into the chicken before filling the leaves. For a stronger Caesar profile, add a teaspoon of Dijon mustard and a few minced anchovy fillets or a splash of Worcestershire to the chicken mixture. If you don’t need to stay strictly low-carb, sprinkle a tablespoon of crushed pork rinds or seasoned breadcrumbs over the top with the Parmesan for an extra-crispy, dunkable crust. Finally, this adapts well to individual tastes: make one casserole with extra red pepper flakes for spice lovers and keep the other milder for kids or more sensitive palates.