In a large skillet or casserole, heat the olive oil over medium heat. Once it is hot, but not smoking, add the garlic and cook just until fragrant, 20 to 30 seconds, stirring continuously. Stir in the rosemary, oregano, thyme and marjoram, and cook for 30 to 40 seconds. Add the guajillo chiles and cook, continuing to stir, for another 20 to 30 seconds. You want them to gently brown, but not burn.