For the meatballs:
1 ½ pound ground lean beef
1/3 cup breadcrumbs
1 large egg
2 tbsp oil
salt, black pepper to taste
For the gravy:
¼ cup unsalted butter
1/3 cup all-purpose flour
4 cups beef broth
¾ cup sour cream
Salt, black pepper to taste
For serving (optional):
2 tbsp chopped fresh parsley leaves
Find it online: https://misswish.com/instant-pot-meatballs