Preheat oven to 400°F (200°C) and prepare a baking sheet with parchment paper.

In a large bowl, mix ground turkey, breadcrumbs, egg, onion, garlic, dill, salt, and pepper until combined.

Roll the mixture into golf ball-sized meatballs and place them on the baking sheet.

Bake for 20 minutes or until golden brown and cooked through (internal temperature of at least 165°F).

In a saucepan, melt butter over medium heat; whisk in flour until golden brown. Gradually add chicken broth and sour cream until smooth.

Add baked meatballs to the sauce and let simmer for five minutes before serving.