Preheat the oven to 375 degrees F. Lightly grease a half sheet pan and set aside.
Combine the baking mix and sugar in a bowl and set aside. Whisk the milk, eggs and lemon extract together and add the dry ingredients, stirring just until combined and smooth. Pour the batter into the prepared pan and press the pear slices into the batter.
Sprinkle the reserved topping over the pears and bake 30 minutes, or until the top of the cake has browned and a toothpick inserted in the center comes out clean. Remove the pan to a rack to cool completely before cutting into 3 by 3-inch squares.
BREAKFAST CAKE TOPPING
Using a fork or two knives, combine the sugar, baking mix and butter until the mixture resembles coarse crumbs. Cover and store in the refrigerator until ready to use.