Heat oil in a medium saucepan over medium heat. Add barley and cook, stirring occasionally, until golden and toasted, about 5 minutes. Add garlic and cook, stirring, for 1 minute more. Pour in broth and bring to a boil. Add orzo and thyme. Stir once, reduce heat to low, cover and simmer for 10 minutes. Remove from the heat and let stand for 5 minutes to absorb any remaining liquid. Stir in chives (or scallion greens) and season with salt and pepper.