So, I decided I should make a tiny bit more effort on the cookie front, and found an old recipe of my mother’s for a sort of three layered bar: layers of oatmeal/flour/sugar/margarine on top and bottom, with a middle layer of apricot jam. Not separate layers you put together after baking like sandwich cookies, you just put the first layer of crumb-stuff in a cake pan, pat it down, spread it with the preserves, sprinkle the rest of the crumbs over the preserves, and pat down gently. Then bake/cool/cut into narrow bars. Dead simple, right?
The thing is, it calls for margarine for the crumb layer, and I don’t think I’ve had margarine in the house for several decades. Can I just swap in equal amounts of butter for margarine, or do I have to make other tweaks? Like add some water, maybe? Because there is no other liquid at all in the recipe, not even any eggs.