Add the 3 cups all-purpose flour, ½ cup brown sugar, 1 tablespoon baking powder, 2 teaspoons cinnamon, 1 teaspoon kosher salt, and ½ teaspoon baking soda to the bowl of your food processor.
Cut the 8 tablespoons unsalted butter into 4 pieces and add it to the food processor. Pulse a few times to chop and incorporate the butter into the dry ingredients. Continue processing until the butter pieces are the size of peas. Transfer to a large bowl.
Fold the 1 apple and ½ cup pecans into the dry ingredients.
Add the 1 large egg, 1 teaspoon vanilla extract, and ½ teaspoon white vinegar to the dry ingredients and stir to combine.
Slowly stir in the 1 cup heavy whipping cream . Drizzle in just enough cream until the dough becomes cohesive.
Squeeze the dough, when it holds together with no crumbs left in the bottom of the bowl, you've added enough cream.
Pour the dough onto a lightly floured surface. Knead the dough a few times until it begins to come together. Flatten the dough and fold it into thirds like you would a letter. Give the dough a quarter turn and repeat this flattening and folding process two more times.
Pat into a disc approximately 1 inch thick and cut into circles using a 2.5″ cutter. You can reshape the scraps and cut out additional scones but they won't be as flaky.
Transfer the scones to a parchment paper-lined baking sheet. To prevent the scones from spreading chill in the refrigerator for 30 minutes.
Preheat the oven to 425°F (220°C) and brush tops with heavy cream. Brushing with heavy creams will encourage browning.
Bake for 18-20 minutes. The scones should be golden brown.