01 -  Preheat oven to 350°F and lightly grease a standard 12-cup muffin tin or line with paper tartlet liners. 
 02 -  In a large mixing bowl, whisk together the flour, brown sugar, baking powder, baking soda, sea salt, cinnamon, ginger, nutmeg, and cloves until evenly blended. 
 03 -  In a separate bowl, blend pumpkin purée, plant-based milk, vegetable oil, vanilla extract, and apple cider vinegar until smooth and homogeneous. 
 04 -  Pour wet mixture into dry ingredients and gently stir until just combined; avoid overmixing. If desired, fold in chopped nuts or vegan chocolate chips. 
 05 -  Divide batter evenly among muffin cups, filling each approximately three-quarters full. 
 06 -  Transfer tray to oven and bake for 22 to 25 minutes, until a toothpick inserted in the center emerges clean. 
 07 -  Allow tartlets to cool in the tin for 5 minutes, then move to a wire rack to cool completely before serving.