Choose avocados that yield slightly to gentle pressure but are not overly soft so they hold their shape while baking. If the avocado halves are tipping, create small rings from crumpled foil to nestle them securely on the baking sheet. For meal prep, you can halve and pit the avocados a few hours ahead, rub the cut sides lightly with oil or lemon juice, cover tightly, and refrigerate until ready to fill and bake. Store any leftover baked avocado egg cups in an airtight container in the refrigerator for up to 2 days and reheat gently in a 350°F oven for 5 to 7 minutes until warmed through. Avoid microwaving, which can cause rubbery eggs and unevenly heated avocado. Serve with extra keto-friendly sides such as bacon, breakfast sausage, or a simple green salad to create a more substantial meal while keeping carbs low.