Step 1: Place the flour, butter and sugar into a food processor. Blitz until the mixture resembles fine breadcrumbs. Or use your finger tips to rub the butter and flour together until you have the same breadcrumb consistency.
Step 2: Add the chopped mixed nuts and oats. Mix until everything is well combined.
Step 3: Fill a large freezer bag with the homemade crumble mixture. Flatten the freezer bag, add a label and place it in the Freezer.
How to make a basic Crumble Topping without Oats and Nuts
Omit the Oats and Nuts and follow Steps 1 and 3 with only the flour, butter and sugar.
Notes
Storage.Fridge: Homemade Crumble Mixture with or without nuts can be made in advance and stored in the fridge for several days. But if you do not intend to use it for some time, ideally it's best to freeze it.Freezer: Place the crumble mixture in a suitable freezer bag or container and place it in the fridge. Take out what you need when you are day to bake. When you are ready to make a crumble, take out the amount of homemade crumble mixture that you need. There is no need to thaw and add it to any stewed fruit or mince pies for a delicious dessert crumble topping. Then bake as per the recipe you are using.FAQ and Tips
To make a smaller batch of crumble mix, use half the quantities
Omit the Oats and nuts to make a plain crumble topping
If you only have Jumbo Oats, blitz them in a food processor for a few seconds
What is the difference between Streusel and Crumble Topping? A Streusel topping often contains the addition of chopped mixed nuts and oats. A basic crumble topping contains flour, butter and sugar.Why Isn't My Crumble Topping Crumbly? To make a crunchy crumble topping, try using the rubbing in method with your fingertips and avoid using a food processor, which makes the crumble topping finer.