I've been asked to bake at someone else's house that I'm traveling to. I thought it might be easier to measure all the dry ingredients at home and combine them in airtight plastic bags until ready to use – like a store-bought mix. Is there any reason this might not work? For example, are any ingredients problematic: cocoa powder, corn flour, or leavening like baking soda/powder (just throwing those out as examples)?
If it matters, I'll be making cornbread and chocolate cake.