In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt until well combined.
In another bowl, mix the milk, egg, melted butter, Biscoff spread, and vanilla extract until smooth.
Pour the wet ingredients into the dry ingredients and stir gently until just combined. Be careful not to overmix; a few lumps are okay.
Preheat a non-stick skillet or griddle over medium heat and lightly grease with cooking spray or butter.
Pour about 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface and the edges look set, about 2-3 minutes.
Flip the pancakes and cook for an additional 1-2 minutes until golden brown and cooked through.
Remove from the skillet and keep warm while you repeat with the remaining batter.
Serve warm with extra Biscoff spread drizzled on top and your favorite toppings like whipped cream or fresh fruit.