Butter is very expensive in my country, but margarine is cheaper. Any suggestions on a substitute for margarine to still get the texture and flavor in baked cakes?
Akos, rather than substituting the butter for margarine, consider using an oil based cake like a chiffon cake. To be honest, I rarely make butter based cakes as they tend to be heavy and dense, and any change of ingredients to create a different flavor tends to throw them out of whack. IMO a good chiffon cake recipe is the greatest recipe you can have in your repertoire.
A chiffon uses oil and water, rather than butter and milk. That means you can change out the water with whatever liquid you want. Butter contains a lot of water, so if you try to add things like passion fruit, its near impossible to figure out the total hydration in your batter. But oil is 100% fat, no water, so you have better control over the hydration when experimenting with different ingredients.
Given the cake calls for water, the possible cake flavors are limited only by your imagination. I've used champagne, sparkling wine, non-alcoholic sparkling grape juice, sparkling apple cider, orange juice, grapefruit juice, lemon juice, elderflower cordial, passion fruit juice--you name the liquid, it's probably ended up in one of may cakes.
A few months ago I baked a elderflower lemon cake with lemon curd filling and white chocolate Italian meringue buttercream. I kid you not, people are still talking about how delicious that cake was...but the thing is no one realizes that the cake base is the same base I use in just about every cake I bake. That how versatile a good chiffon cake recipe is--one recipe, a thousand cakes.
Now I will admit converting a chiffon cake into a layer cake can be a bit of a challenge. You have to use a thin heating rod so the cake does not collapse; and the cake needs to cool upside down. And a chiffon cake uses a lot of egg whites. But eggs are cheaper than butter. I use the egg yolks to make the curd and use it as the filling.
Do NOT grease the pan--ever, when baking a chiffon cake as the grease will cause the cake to collapse. Just use baking paper to line the bottom on the cake pan. Make a tiny hole in the center of the baking paper to insert the heating rod. As soon as the cake comes out of the oven, invert it on to a rack that is elevated about 4 inches off the countertop. I place drinking glasses under the rack to elevate it.
These are the heating rods I have. But you can use a flower nail. Its just that most flower nails are made of a tin, so they rust over time.
https://www.amazon.com/Inch-Cake-Ba...ocphy=1014226&hvtargid=pla-379120303117&psc=1