Do not overbake the muffins; overcooked eggs become rubbery. Check at the 20-minute mark.

For easy removal and cleanup, use silicone muffin liners.

Chop the spinach finely to prevent soggy or uneven muffins.

Season the egg base well with salt to enhance the flavors.

If using frozen spinach, thaw it completely and squeeze out all excess moisture to avoid soggy muffins.

Store cooled muffins in an airtight container in the refrigerator for up to four days.

For longer storage, freeze individual muffins wrapped in plastic wrap in a freezer-safe bag for up to two months.

Reheat refrigerated muffins in the microwave for 30-45 seconds, or use a toaster oven for a crispier exterior.

For substitutions, kale can replace spinach (sauté first to soften).

Add more protein with halal certified ground beef or chopped halal chicken breast.

Experiment with different halal-certified cheeses like sharp cheddar or goat cheese.

Add a pinch of red pepper flakes or halal hot sauce for heat.

A squeeze of fresh lemon juice over finished muffins adds brightness.

Always ensure all substitutions and variations adhere to halal guidelines, avoiding non-halal additives.

To make dairy-free, omit the feta and add extra halal certified ground beef or other vegetables like bell peppers.