For the cinnamon syrup, in a small saucepan combine sugars, flour, and cinnamon. Stir well, then add vanilla and water. Bring to a boil, stirring occasionally, then remove from heat and set aside until ready to use.
½ cup (100 grams) granulated sugar, ½ cup (100 grams) light brown sugar, 2 tbsps (16 grams) all-purpose flour , 1 tsp (3 g) ground cinnamon, 1 tsp (5 ml) vanilla extract , 1 cup (250 ml) water
For the pancakes, in a large bowl whisk together flour, sugar, baking powder, cinnamon, nutmeg, and ginger.
1 cup (130 grams) all-purpose flour, ½ cup (100 grams) granulated sugar, 1¾ tsps (7 g) baking powder, ½ tsp (1.5 g) ground cinnamon, ¼ tsp (0.5 g) ground ginger, ¼ tsp (0.5 g) ground nutmeg
In a medium bowl lightly beat the egg yolk. Add milk, pumpkin, and vanilla. Slowly stir in melted butter so it doesn’t cook the yolk. Mix into dry ingredients just until combined.
1 large egg, ¾ cup (177 ml) whole milk, ½ cup (122 g) pumpkin purée, ½ tsp (2.5 ml) vanilla extract, ½ cup (112 g) butter
In another bowl beat the egg white until stiff peaks form, then gently fold into the batter.
Heat a greased griddle or skillet over medium-high heat (about 375°F/190°C). Pour about ¼ cup (60 ml) batter for each pancake. Cook until bubbles form and edges look dry, then flip and cook until golden.
Serve with warm cinnamon syrup, or keep pancakes warm on a rack in a 200°F/95°C oven.