For the best texture, use thick-cut bacon so the cups stay sturdy as they bake and lift out easily. Choose ripe avocados that yield slightly to gentle pressure without being mushy, which gives a creamy center that pairs beautifully with the crisp bacon. If you want to reduce calories and fat slightly, you can omit the cheddar or Parmesan, but keep in mind that the cheese adds richness and helps bind the avocado mixture. To avoid overcooked eggs, start checking doneness a few minutes early, since every oven runs a bit differently. These cups reheat best in the oven or toaster oven, which helps crisp the bacon again, while microwaving is faster but will soften the bacon and slightly change the texture. Serve alone for a very low carb breakfast or pair with a side of leafy greens dressed in olive oil and lemon juice for extra fiber and micronutrients while staying keto.