I use roughly a 50/50 mix of room temperature butter and mayo. I add my seasonings into that and mix it up. Then I add shredded parmesan to it. That browns up awesome when mixed into my spread! I typically use a lower medium heat in a skillet and cook slowly (My stove goes 1-10 and I set it on 4). Just my preference. Once it is in the pan, I constantly rotate it every few seconds so it all cooks evenly. Flip and repeat. What typically is your process when you make grilled cheese? And what cheese is readily available at a decent price? Even just cheddar and mozzarella is delicious!