Line a baking sheet with aluminum foil. Place trimmed carrots on top. Whisk together maple syrup, dijonnaise, olive oil, salt and red pepper flakes. Pour 2/3 of the mixture on top of the carrots and toss to coat completely. Place in oven to bake for 35 minutes, tossing half way through to cook evenly on both sides.
Once carrots are done cooking, heat up the 1/3 leftover mixture (I just heated mine up in the microwave for 30 seconds) then pour over the cooked carrots. Topped with a little extra salt, chives, and pistachios before serving!