First soak the dates in boiling water for 30 mins, then drain them.
Blend the dates with the oat milk, vanilla, maple syrup, peanut butter and a pinch of salt until smooth. Add a splash of water if needed to loosen the mix.
Combine the oats, flax seeds, Greek yoghurt, and oat milk in a bowl. Mix well, then cover and set aside to soak.
Slice the bananas.
Grab some glasses or jars and start layering up. Spoon a little of the oat mixture into the bottom of your glasses, followed by a spoonful of the toffee sauce and a few banana slices. Repeat the layers in each glass until everything is used up. Top each with a dollop of Greek yoghurt (if using) and a scattering of granola. Pop in the fridge overnight, ready for tomorrow's breakfast.