Start by heating olive oil and butter in a skillet over medium-low heat. Add the thinly sliced onions to the pan and stir occasionally to coat them in the oil. Now, it’s all about patience! Keep cooking the onions for around 20–30 minutes, stirring every few minutes, until they turn a rich golden brown. The transformation is magical!

While the onions are caramelizing, take another skillet and lay down the thick-cut bacon slices. Fry them over medium heat until they achieve your ideal level of crispness. Whether you like them chewy or crunchy, it’s entirely up to you. Once cooked, place the bacon slices on paper towels to soak up any excess grease.

Toast your bread slices until they’re delightfully golden. Spread your favorite condiment like mayonnaise or mustard on one side of each slice. Start building your sandwich by layering the caramelized onions, followed by the crispy bacon. Add extras like lettuce or tomato if you like, then crown it with the second slice of bread. Enjoy your masterpiece!