Adam and Maxine's Famous Latkes

INGREDIENTS

3 lb

large russet potatoes (4–6)

1 lb

Vidalia or yellow onions (about 2 medium)

1/4 cup

fine plain dried breadcrumbs

3 1/2 tsp

kosher salt

2 tsp

baking powder

1/4 tsp

freshly ground black pepper

–3 large eggs

2 tbsp

(or more) schmaltz (chicken fat; optional)

2 tbsp

(or more) vegetable oil

Applesauce and sour cream (for serving)