The Topping calls for 4 tablespoons of soft butter but I can't use dairy so could you recommend a good substitute that will keep the crumble in chunks since I doubt oil would be a good idea there. Thanks so much! I'm looking forward to making this as I use the GF Muffin mix once a month to make different flavored muffin tops for myself so switching it up with a coffee cake sounds yummy. I am so glad that you are making good use of this mix- it seems to be a favorite among our Gf fans! Yes, you can use a butter substitute. Earth Balance makes a great soy-based stick that is comparable to the flavor of butter. ~Amy

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