Preheat the oven to 175 Celsius / 350 Fahrenheit.
Put the ingredients for the base and the top layer in separate bowls and mix with a fork, then knead with your hands to combine.
Line an ovenproof dish with parchment paper. Spread the base layer, then add the top layer to fit a space of approximately 5 x 6 inches.
Bake for up to 25 minutes. The bars are ready when the top has set and is beginning to brown around the edges. Remove and let cool to room temperature before cutting.
