For baking I find sweet almond or hazelnut oils the best... it does not have any strong taste or smell and it gives cake nutty fragrance. (coffeeandvanilla.com)
Toast in the oven until the nuts are lightly browned and release a nutty fragrance, about 15 minutes. (epicurious.com)
Add flour and whisk vigorously, cooking flour for 1 - 2 minutes until it gives off a nutty fragrance. (katieatthekitchendoor.com)