The 15oz (pre-shrinkflation) Betty Crocker mix weighs 432g, 2/3 the weight of your recipe's flour and sugar alone, so your recipe is for a much larger cake.

Wal-Mart's own brand flour is about (Canadian) $C0.15/kg if buying 2.5kg, cake & pastry flour more like 24 cents/kg. Granulated Sugar is C$0.15/kg. I'm not sure where you're buying flour & sugar.

Your most expensive ingredient is butter but you could have easily chosen a recipe without butter. I reckon the cake with butter will be much better than BC's version though.

Other advantages of baking with a recipe are being able to scale the recipe up or down as needed, and always having the ingredients for many different recipes on hand without having to buy a vanilla cake mix, a brownie mix, a pancake mix, a waffle mix etc.

The main advantage of a recipe is tweakability. I find most commercial cakes far too sweet, and when I bake from a recipe I can find the point to which I can reduce the sugar without it becoming too bland.

I don't know whether they're harmful but I'm quite happy to cook a cake without Propylene glycol, Xanthan gum, cellulose gum, sodium stearoyl lactylate, monoglycerides, and monoesters of fatty acids

I've always been baffled by the popularity of pre-made recipe boxes. Maybe useful if I was camping or something, but not when I have access to an actual kitchen.

So, cake flour?

Basic cake recipes are simple enough for even younger children to do and are a great way to teach basic cooking skills.

And if you only use flour and sugar twice a year then there's probably other things you would be better off making yourself.

> Because you have little kids and you want to give them a single easy-to-follow box with instructions on it?

Box mixes are a very US thing. I promise you that kids still get to bake in other countries. Having done both it is my opinion that messing with the raw ingredients is more fun.

Assembling your own cake mix is pretty easy if you really wanted to. Stick it in the freezer for whenever. However the prepackaged stuff is still likely to taste better because it uses industrial ingredients that will simply taste better.

A quick look at the first Betty Crocker mix I found on Safeway's site showed: corn syrup, xantham gum, and cellulose. Those will all contribute to the final texture and moistness.

I'm renting an apartment with a broken oven. I bought a used electric tabletop oven from the thrift store for US$17, several times larger than a toaster oven, with bimetallic thermostat and mechanical timer. I live in Argentina, but my memory is that rich-country thrift stores and garage sales have even lower prices, because there are less poor people competing to buy their wares. When my mother moved to Japan, she furnished her whole house from the sodai-gomi. For free.

My experience with poverty is that the main obstacles to things like cooking isn't lack of resources like ovens exactly. Rather, it's more like lack of autonomy; maybe someone will take your oven away because they are afraid you'll set the building on fire, or because they want it, or a combination. Or you're just mired in learned helplessness to the point it doesn't occur to you. Or you're not functional enough mentally to keep the oven clean enough to use. Or the police sweep your camp and your oven goes in the dumpster along with your birth certificate. Or maybe you can get the oven but your work shifts lack the predictability to be able to plan meals ahead of time.

But it's almost never because you can't come up with the US$17.

SNAP like implies some poverty. They are likely not representative. Though it is still shocking.

i'm also shocked how many people I know who eat out often at fast food. I can make a better meal for less and it will be healthier as well. Even hight end resteraunts are obviously reheating the same industrial froozen meals.