Spinach Feta Triangles

Why I Love This Recipe
Working with phyllo dough can test your patience... but I do recommend this recipe. It's easy and your guests will love it! I made them as appetizers for a recent family gathering and my mother-in-law was convinced I had bought them.
Ingredients You'll Need
1 tablespoon butter
1 egg, lightly beaten
1/2 cup onion, finely chopped
1 pkg frozen chopped spinach, thawed and drained
8 sheets phyllo
1 cup crumbled feta cheese (I recommend using Athens brand, the tomato/basil flavor - it's delicious!)
1 stick butter, melted
salt
pepper
Directions
In a skillet, melt butter and cook onion until softened (about 5 minutes). Remove your pan from the heat and stir in your spinach, cheese and egg. Add salt and pepper.
Preheat oven to 375 degrees.
Roll out one layer of phyllo dough and brush with butter. Top with another layer of dough, brush with butter. Repeat once more. Cut rectangle into 3 even pieces (or 5 pieces if you want smaller triangles).
Place tablespoon of the spinach mixture in lower left corner of one of the pieces and fold up as you would a flag - folding the lower corner up to form a triangle and continuing to fold up in the shape of a triangle.
Place triangles on a baking sheet. Bake for 15 minutes until golden brown and puffed.
Instead of baking, you can also place them on a baking sheet and freeze them for an hour. Then put them into an air tight container or freezer bag.