Spanakopita Baked Eggs

Bahan-bahan (4 porsi)

• 1 -1/2 lbs frozen spinach (thawed [24 ounces])
• 1 tsp olive oil
• 1/2 medium yellow onion (thinly sliced [1 1/2 cups])
• 1 tsp kosher salt
• 1/2 cup chopped scallions ([3-5 scallions depending on the size])
• 1/2 cup chopped dill
• 3/4 cup crumbled feta
• Juice of 1 lemon
• Black pepper (to taste)
• 4 large eggs