Preheat the oven to 350°F.
Cut pears in half and remove the core. Toss in lemon juice and set aside.
Grease an oven-safe skillet or baking dish and set it aside.
In a large bowl, whisk together two-third cups of Bisquick and one-half cup of white sugar.
In a separate bowl, using an electric mixer, beat together one and one-half cups of milk, four large eggs, three tablespoons of maple syrup, and one teaspoon of vanilla extract.
Mix the egg-milk mixture into the dry mixture until combined.
Arrange pears in the prepared baking skillet or pan. Pour the batter over top and add two tablespoons of diced butter.
Bake in preheated oven for forty-five minutes or until the pears are fork-tender and the custard is golden brown.
Sprinkle with one tablespoon of confectioners’ sugar and place in an oven broiler until bubbly.
Let cool for ten minutes and serve with a scoop of vanilla ice cream if desired.