Melt butter in pan.
Add onions and mix to coat.
Cook onions for 15 minutes and then add sugar.
Continuing cooking for another 15 to 20 minutes or until caramelized, stirring frequently.
Remove from heat and set aside. Now, we’ll prepare the phyllo cups.
Preheat oven to 350 F.
Brush muffin pan with some butter.
Brush 1 sheet of phyllo and place it in the muffin cup, repeat 2 more times slightly rotating them.
Once done, sprinkle the bottoms with some feta, then add a spoonful of the caramelized onions in each phyllo cup.
Top with some more feta and bake for 10-15 minutes, or until golden brown.
Remove, plate, and serve you delicious Caramelized Onions And Feta Phyllo Cups!