Preheat the oven to 220℃/428℉.
Cut the 6 slices of bread into small sticks (3 per sandwich).
Roast the bread sticks for +/- 15 minutes.
Meanwhile, pour the milk in a small container.
Add 1 cup of flour, cinnamon, sugar & vanilla powder, and mix together.
Add more flour until it reaches the right consistency (thick batter) and set aside.
Take the breadsticks out of the oven and allow to cool down for a few minutes.
Place the bread sticks in the mixture and place in the fridge for 25-30 minutes.
Heat up a non-stick frying pan over high heat.
Add halve a tablespoon of butter and reduce the heat to medium-low.
Take 1 bread stick at a time, place in the frying pan until completely covered.
Bake both sides until dark-golden brown.
Top off with your favourite berries, syrup, cinnamon and/or sugar.