Orange, blueberry and olive oil muffins and a lactose problem

I know how rare it is nowadays to post recipes on the blog on two consecutive days, and I am still running around like a headless chicken trying to do everything I have to do lately, but since next week will be even busier than the week ending today I decided to go crazy and bring you these muffins: again a speedy recipe, but a very delicious one. These muffins are golden and really moist, very