What happens next?

How to make eggless plum cake
Preheat the oven to 400f/200c.
Prepare the baking sheet (baking tray) with parchment paper (baking paper).
Sift the flour over a large bowl.
Add the butter and rub in with the tips of your fingers quickly to avoid heating it too much.

Options are:
A). Sift the cupcake mix and vanilla extract together in a large bowl. Mix them until they're well mixed..
B). Once the flour has turned a light golden colour, (set aside) flour the inner panel of the cake. The basting won't begin until it has set there..
C). Set the bowl aside and start the warm up process. Whisk together the milk, sugar, eggs, and vanilla together in a medium mixing bowl..
D). When the mixture looks like breadcrumbs, stop rubbing in the fat. Pour in the sour cream and almost all of the milk (keep back some of the milk to create the glaze)..
D).