Preheat the oven to 375 degrees.
Trim the ends off the broccolini and chop the carrots and leeks. Then add all the veggies to a large bowl. Drizzle the olive oil on top, sprinkle with the 1 teaspoon of curry powder, and sprinkle with a few pinches of salt and pepper. Toss to coat all of the veggies.
Spread the veggies evenly onto a sheet pan, and roast at 375 degrees for 15-20 minutes. Or until the veggies are cooked through and the broccolini is getting brown on the tips.
While the veggies are roasting, cook the rice noodles according to package directions. Drain when they are done.
While everything is cooking, make the creamy curry sauce. Add all of the creamy curry sauce ingredients to a medium sized mixing bowl. Whisk to combine. Add a generous pinch of salt and a pinch of pepper. Then whisk again until totally smooth. Taste and adjust seasonings. Set aside.
When the veggies and noodles are done, toss the noodles with about 1/2-3/4 of the sauce. Coat all the noodles with sauce. Add some to a bowl, then top with some of the roasted veggies, then top with a bit more sauce. Serve.