Prepare the dry ingredients by whisking together the all-purpose flour, light brown sugar, ground cinnamon, baking powder, and kosher salt in a large bowl for 1-2 minutes.

Mix the wet ingredients in a separate bowl by combining whole milk, buttermilk, large eggs, vanilla extract, melted butter, and lemon juice, whisking until smooth.

Combine the mixtures by slowly pouring the wet ingredients into the dry mixture, stirring gently until just combined, then fold in grated Granny Smith apples.

Preheat the griddle over medium heat for about 5 minutes and grease with butter until ready.

Cook the pancakes by pouring ¼ cup of batter onto the heated griddle, cooking until bubbles form and edges set, flipping to cook until golden brown.

Serve warm with whipped cream, diced apples, and a sprinkle of cinnamon.