Add all the base ingredients (except the water) to a food processor and blend until soft and smooth. This might take a few minutes. If it doesn't come together then add 1 tbsp of water (only add the other one if it doesn't come together - it will depend on how soft your dates are and which nut butter you use)
Press down into lined mini brownie tin (or a muffin tin) and refrigerate whilst you make the topping
Mix the topping ingredients together and spoon over the top, then sprinkle over a handful of nuts/seeds and put back into the fridge for at least an hour.
Store in the fridge.
