Spanakopita

Ingredients

• 4 Tbsp. olive oil
• 2 cups onion, chopped
• 2 (10 oz.) packages frozen chopped spinach, thawed, drained and squeezed dry
• 2 Tbsp. fresh dill, chopped
• 2 Tbsp. whole wheat flour
• 2 (4 oz.) packages fat free feta cheese, crumbled
• 1 Tbsp. apple cider vinegar
• 1/4 cup raisins (packed), finely chopped
• 6 egg whites, lightly beated
• 1/4 tsp salt
• 1/2 tsp. black pepper, ground
• 3/4 of a 16 oz. package of pyllo dough - about 28 sheets
• buttery cooking spray