Preheat waffle maker. Mix first 7 ingredients in order listed just until smooth. Bake waffles according to manufacturer’s directions until golden brown.
Meanwhile, for topping, combine water, sugar, cornstarch and corn syrup in a small saucepan over medium heat until thickened. Remove from heat; cool. Stir in berries. Serve warm over waffles; if desired, add vanilla ice cream.
Test Kitchen Tip
As you can imagine, corn syrup isn't an ingredient Amish cooks would have available to them but it does give the sauce a velvety texture and consistency. You can certainly leave it out, just add additional sugar to your desired sweetness level.
If using frozen blueberries, use without thawing to avoid discoloring the batter.