Instructions

1. Preheat the oven to 350°F and grease a 9×13-inch baking pan with butter.
2. Cook diced bacon in a medium skillet until crisp, then add diced onions and cook until soft for about 4 minutes.
3. Sprinkle flour over the bacon mixture, cook for one minute, then gradually stir in milk, Greek yogurt, and 1/4 cup cheddar cheese until thickened; season with salt and pepper.
4. Boil salted water, cook green beans for 5 minutes until tender-crisp, then drain and shock in ice water before patting dry.
5. Combine panko breadcrumbs, grated parmesan, and melted butter in a small bowl until coated, then set aside.
6. Mix the bacon mixture with the green beans in a large bowl, spread into the prepared baking pan, and top with remaining cheddar cheese and panko mixture; bake for 30 minutes until golden brown.