Melt butter in a medium saucepan over medium heat until a deep golden brown, stirring occasionally. Remove from heat and transfer to a small bowl. Chill brown butter at least 30 minutes or until solidified.
Apple Preserves
In a medium saucepan over medium-high heat, combine apples, butter, sugar, molasses, and spices and bring to a low simmer, stirring occasionally. Reduce heat to medium-low and let simmer 15-20 minutes until reduced and thickened. Add vanilla and keep warm.
Biscuits
In a large bowl, whisk flour, baking powder, baking soda, sugar, and salt until combined. Remove browned butter from refrigerator and use your fingers to work chilled butter into flour mixture until mixture is crumbly.
Pour buttermilk on top of flour mixture and gently fold until a shaggy dough forms. Turn dough out onto a lightly floured surface and very gently knead several times until dough just comes together (do NOT overknead dough or biscuits will be tough)
Pat dough into a 1-in thick rectangle and use a 1-in biscuit cutter to cut biscuits out. Place biscuits 2-in apart on parchment paper-lined baking sheets. Chill biscuits in freezer 15 minutes.
Preheat oven to 400F. Bake biscuits 12-15 minutes until a deep golden brown. Let biscuits cool several minutes then split open and serve warm with apple preserves. Enjoy!