I've been doing this ages, you need the right shades of bronzer and to put the blush in the right place. You want to go for a matte brown, like the colour of a shadow, rather than an orange bronzer. I use the Kevyn Aucoin sculpting powder but I'm big on beauty, work in PR and got it free through work. It's really expensive and there are cheaper alternatives.
You can also use darker and lighter foundations in different parts of your face to contour.
It takes practice to learn how to apply it to your face, but once you do it takes minutes. The powder should go in the hollows of your cheeks, the blush on your cheekbones near your ears, never on the apples of your cheeks as it makes your face look wider, and highlight just above the blush in a 'c' shape around your temple and cheekbone.
You can also put the contouring powder under your chin, down the sides of your nose to slim it, and up your temples.
Screw using all the creams and crap that goes under foundation like the Kardashians do, it's easy enough and looks good enough to just use powders. I go all out on nights out and use creams, but use powders in the daytime. It looks more natural. It just slims my face a little, as I've still got juvenile chubby little cheeks