Pour milk, eggs, and oil into the blender and blend briefly.
Add flour, salt, and baking powder and blend everything well into a batter.
Heat a waffle iron with butter. You may be able to omit the butter after baking a few, but start by using a little butter for the first waffles.
Bake the waffles until light brown and crispy.
Serve sprinkled with powdered sugar and jam as an accompaniment.
Keep the display on
Notes
You can also serve the waffles with vanilla ice cream, chocolate sauce, or whipped cream. If you want to make it a bit healthier, you can serve them with fresh fruit - possibly as a fruit salad - or in cubes.