Preheat your oven to 200°C.
Place the cauliflower florets, quartered tomatoes and chopped red onion into a large bowl. Toss with the coconut oil and sprinkle with 1.5 tsp of the curry powder, reserving the rest for later, until well combined and the curry powder is evenly dispersed. Place on a large, rimmed baking sheet in one layer and sprinkle generously with salt and pepper.
Add the remaining curry powder, the cashews and a pinch of salt and pepper into a small food processor and pulse until broken down but leaving some cashews a little chunky for texture.
Dry the chicken breasts off and place the egg white into a shallow, sided plate. Additionally, place the cashews into a shallow, sided plate. Dredge a chicken in the egg white, gently shaking off any excess, and then press into the cashews. Flip and press the other side into the cashews, lightly pressing to adhere cashews both sides of the chicken.
Place the chicken breast onto a small cooling rack (one that fits on your sheet pan, and preferably one with legs so it sits over the veggies. This allows both sides of the chicken to cook and get crispy.) Repeat with the remaining breasts.
Place the cooling rack on top of the sheet pan, over top of the veggies, until meat is cooked – which takes about 14-15 minutes.
Once cooked, toss the fresh cucumbers onto the pan, and garnish with mint and cilantro.