For a spicier kick, use pepper jack cheese or add a pinch of cayenne pepper to the egg mixture. Feel free to substitute other vegetables like mushrooms, zucchini, or sun-dried tomatoes. To prevent sticking, ensure your Bundt pan is thoroughly greased, even if it's nonstick. If the top of the cake starts to brown too quickly during the final baking stage, tent it loosely with foil. Leftovers can be stored in the refrigerator for up to 3 days. Reheat individual slices in the microwave or oven.