Combine together the flour, sugar (or sweetener), baking powder, baking soda and salt in a large-sized bowl. Make a well in the center and add the milk, slightly cooled melted butter, vanilla and egg.
Use a wire whisk to whisk the wet ingredients together first before slowly folding them into the dry ingredients. Mix together until smooth (there may be a couple of lumps but that's okay).(The batter will be thick and creaming consistency. If you find the batter too thick -- doesn't pour off the ladle or out of the measuring cup smoothly -- fold a couple tablespoons of extra milk into the batter at a time until reaching desired consistency). Set the batter aside and allow to rest while heating up your pan or griddle.
Heat a nonstick pan or griddle over low-medium heat and wipe over with a little butter to lightly grease pan. Pour¼ cup of batter onto the pan and spread out gently into a round shape with the back of your ladle or measuring cup.
In a small bowl, mix the red wine vinegar, sugar, dried oregano, crushed red pepper flakes, salt, and pepper until the sugar has melted into the mixture.
When the underside is golden and bubbles begin to appear on the surface, flip with a spatula and cook until golden. Repeat with remaining batter.
Next, transfer all this pepper and onion mix into a baking dish, spreading it evenly.
Serve with honey, maple syrup, fruit, ice cream or frozen yoghurt, or enjoy plain!