Potato & Jalapeno Casserole 8 large potatoes 3 large onions Oil for frying 6 jalapeno peppers, thinly sliced 1 pound Monterey jack cheese, shredded Salt and pepper to taste Peel and slice potatoes and onions. Fry potatoes in oil in skillet just until tender; drain. Alternate layers of potatoes, onions, jalapenos, cheese, salt and pepper in a 9 x 13-inch baking dish. Bake at 300 degrees F for 30 minutes.