This quick bread basically uses the muffin method of mixing: dry ingredients in one bowl, wet ingredients in another, mix together very quickly till just blended. The difference is that it is baked into a large cake, rather than small muffins. For me, I often do the opposite and bake cake recipes into muffin or cupcake sizes because they need less time in the oven and hence use less electricity.
Don’t let the ‘rub butter in flour’ bit fool you into thinking this uses the rubbing-in method (see Plain Scones). Here, it is just a way to incorporate solid butter. Other recipes melt the butter and combine it with the wet ingredients. Personally, I’m lazy to melt butter when I make muffins, and usually use oil instead :). A cooking oil with a neutral flavour is best, but coconut oil will give a strong tropical flavour if that’s the effect you intend to produce.
For more on oven temperatures, see grandma’s notes here.