Can I make my crumble topping in a mixer? I have a basic crumb topping that I use to top fruit crumbles. It consists of 1 cup brown sugar, 1 cup flour, and 1/2 cup margarine. I like to make it in big batches and freeze in individual bags in the freezer so that I can just pull it out and sprinkle it on top of the fruit whenever I need it. The trouble is that the recipe calls for it to be made by hand, and I really really dislike making it... My hands end up hurting badly for a while after, and it takes a long time to get the margarine off.

Can I make it in a stand mixer or would that affect the quality? I would probably use a cookie paddle to mix it.
You could use just about anything to mix that, a food processor, a mixer, a stand mixer (just about any attachment), even a blender would work in pulses. Freezing it too will work just fine. Just move fast because any of those methods will create heat, and heat will melt butter. As long as your ingredients are mixed and your butter (margarine) isn't melted, you're golden.