Swedish Meatball Noodle Bake

Ingredients
For The Meatballs

2 tbsp olive oil
1 pound ground beef
1 large egg, beaten
½ c. breadcrumbs
½ onion, grated
½ tsp garlic powder
¼ tsp ground nutmeg
1 tsp Kosher salt
½ tsp freshly ground black pepper
For The Casserole