Can I make this casserole ahead of time?
Yes. Assemble the casserole in the baking dish, cover, and refrigerate up to 24 hours. Add 5-10 minutes to baking time if baking from cold. You can also bake, cool, and refrigerate leftovers for up to 4 days, then reheat covered in a 350°F oven until warmed through.
What can I substitute for the jalapeños?
Omit them for a milder flavor, or swap in diced green chiles, diced bell peppers, or crispy fried onions. Fresh diced jalapeños work if you prefer less acidity than pickled.
Can I use a different cheese?
Yes. Cheddar, pepper jack, or a Mexican cheese blend all work well. Use 1 cup shredded cheese total.
How do I know when it's done baking?
Insert a toothpick into the center at 40 minutes; it should come out clean with no wet batter. If still moist, bake 5 more minutes and test again.
Can I double this recipe?
Yes. Double all ingredients and use a 9x13 inch baking dish (standard size). Baking time may increase to 45-50 minutes; check with a toothpick for doneness.