Reheat in the microwave on a paper towel or napkin. Cooking times vary depending on your microwave oven, but approximately 1 1/2 to 2 minutes if frozen or 30 seconds if thawed.
Suggestions for what to put in egg bites:
diced green or purple onions, chopped red or green pepper, pre-cooked deli ham, pre-cooked sausage, crumbled cooked bacon, cooked diced turkey, shredded cheese (cheddar, Gruyere, Swiss, jalapeño jack, or a blend), diced jalapeños, spinach, broccoli