This recipe I have got from my mom and it makes absolutely fantastic waffles.
250 ml milk
2 tbsp sugar
2 tbsp vegetable oil
0.5 tsp salt
0.5 tsp baking powder
Flour to make middle tick liquid dough, it should be the same thickness as for pancakes.
Mix all very well and leave for 30 minutes. Preheat waffle iron to desired temperature. Than bake the waffles until golden brown.