It’s already in your fridge.

Over the years, Ive experimented with my recipe to achieve this.

In the process, I discovered my one non-negotiable ingredient:jarred pepperoncini!

Overhead shot of a tuna noodle casserole in a white square baking dish

Simply Recipes / Getty Images

The slightly crunchy texture of the peppers is another welcome addition to the dish.

Plus, a jar is almost always sitting in my fridge!

I simply slice a handful and add them to the casserole mix before baking.

Sideview of a plate with a serving of tuna noodle casserole

Simply Recipes / Ciara Kehoe

I make a few different variations of my pepperoncini tuna casserole, too.