Frittatas can be baked ahead of time. Cool, then refrigerate up to 4 hours. When ready to serve, cover loosely with foil then reheat in a 350ºF oven 5 to 10 min. or just until warmed.
If there are any empty mini muffin cups in the pan, fill each empty cup with 1 Tbsp. water so the frittatas will bake more evenly.
Substitute KRAFT Real Mayo Mayonnaise for the MIRACLE WHIP.