Heat olive oil in a large, heavy skillet over medium-high heat and add garlic and chile. Stir for about 10 seconds and add ground coriander and cumin. Stir for about 10 seconds, until mixture is very fragrant, and add carrots, sugar and salt to taste. Sauté, stirring often or tossing in the pan, for 5 minutes and turn heat down to medium. Continue to cook, stirring often or tossing in the pan, for another 10 minutes, until carrots are tender and lightly colored. Add butter, quinoa and mint or cilantro and stir or toss in the pan for another minute or two, until quinoa is warmed through and butter has melted. Taste and adjust seasonings. Serve hot or warm.