Baked Eggs with Spinach

Bahan-bahan (4 porsi)

• 2 tsp olive oil
• 1/4 cup diced shallots
• 1 1/2 lb baby spinach (large stems removed)
• 4 large eggs
• salt and freshly ground pepper (to taste)
• 2 tbsp Asiago cheese (shredded or Parmesan)
• baking spray