Fluffy Pumpkin Pancakes Recipe

1½ cups whole milk
2 TB vinegar
1 cup 100% pure pumpkin puree
1 large egg
2 TB olive oil
6 TB brown sugar, packed
1 cup all purpose flour
1 cup whole wheat flour
2 tsp dry flax meal
2 tsp baking powder
1 tsp baking soda
½ tsp nutmeg
½ tsp cloves
1½ TB cinnamon
½ tsp ground ginger
½ tsp table salt
chopped pecans or walnuts for garnish
pure maple syrup for serving