Sweet potato, red onion and broccoli meet in these muffin-sized frittatas, which will be perfect for a brunch or a picnic. They are quick, easy, and as good warm as cold!
1 medium sweet potato
220 g brocoli florets
1/2 red onion
crumbled feta or goat cheese (optional)
3 tbsp milk (or rice or almond milk) (optional)
1/2 tsp red pepper flakes (or paprika)