Take the left over vegetables and roast potatoes and pull out the potatoes.
Place the potatoes into a blender and pulse until coarsely chopped up into pieces that are roughly half a cm in size.
Take the potatoes out of a blender and place in a large mixing bowl.
Place two thirds of the carrots and green vegetables into the blend and pulse to roughly the same size or a bit smaller than the roast potatoes.
Transfer the blended vegetables to the same mixing bowl as the potatoes.
Place the remaining veg into the blender and blend for sixty seconds until it is a very fine size and the consistency of a thick paste.
Transfer the vegetable paste to the same bowl as the other ingredients.
Add a generous pinch of salt and pepper.
Mix the ingredients all together.
The combination of the larger pieces of potatoes and veg will be beautifully held together by the thick vegetable paste and allow all the flavours to mix well.
Place a large non-stick frying pan on the hob and heat on a medium to high heat.
Add the oil and butter and allow to warm up.
Drop the bubble and squeak mixture into the hot oil and spread it out evenly across the frying pan.
Let it cook for a few minutes and then begin to mix and flip over to ensure a crispy crust throughout.
Once the bubble and squeak is nice and hot throughout and has a good crispy coating it can be served.