Step 1Heat the oven to 350 degrees. Grease and flour standard muffin pans, or grease the tops of the pans and line with cupcake liners.
Step 2In a large bowl, whisk together the flour, sugar, salt, baking soda and cinnamon. Stir in the apples, then the oil, vanilla and nuts. This makes about 5 cups of batter.
Step 3Divide the batter among the prepared muffin pans, filling them about one-half to two-thirds full. Bake until a toothpick inserted comes out clean, about 30 minutes, rotating halfway through for even baking.