Turn on your waffle iron and let it heat for 2 to 3 minutes.

Pour 2 cups of Bisquick mix into a large mixing bowl.

In a separate small bowl, whisk together 1 1/3 cups milk, 1 egg, 1 tablespoon melted butter, and 1 teaspoon vanilla extract until well combined.

Pour the wet mixture into the bowl with the Bisquick mix and stir gently with a whisk until just combined.

Allow the batter to sit for 1 to 2 minutes.

Lightly oil the waffle iron with a silicone brush.

Pour about 1/2 to 3/4 cup of batter onto the center of the preheated waffle iron.

Close the lid and cook for 2 to 3 minutes until golden brown.

Carefully lift the finished waffle from the iron and place it on a serving plate.