Bacon and Feta Dutch Baby - Master recipes

Ingredients

• 8 bacon strips, chopped -
• 1 small red onion, chopped -
• 1/2 cup all-purpose flour -
• 1/2 teaspoon dried oregano -
• 1/2 teaspoon salt -
• 1/4 teaspoon pepper -
• 3 large eggs, room temperature -
• 1/2 cup whole milk -
• 2 tablespoons butter -
• 1 cup fresh spinach -
• 1/2 cup crumbled tomato and basil feta cheese -