Prep the veggies: peel or spiralize the carrots and cucumber into noodles. Using a paper towel or clean cloth, dry off the cucumber.
Add peanut butter, maple syrup, soy sauce, lime juice, sesame seeds, and the water to a bowl. Whisk until smooth and pourable. Add more water if needed to reach your desired consistency.
Add carrot and cucumber noodles to a large bowl and toss with the dressing until evenly coated.
Top with crushed peanuts, cilantro, and green onions. Enjoy immediately for maximum crunch, or chill briefly to let flavors meld.