Preheat oven to 375oF (191oC) and line a baking sheet with parchment paper.
Toss the cauliflower with half the olive oil and transfer to a baking sheet along with the chicken breasts. Sprinkle everything with sea salt.
Place the baking sheet in the oven for 30 minutes, or until chicken is cooked through. Toss the cauliflower at the halfway point.
While the cauliflower and veggies are cooking, massage the kale with lemon juice and remaining oil. Divide between bowls.
Remove the chicken and cauliflower from the oven and divide between bowls, on top of the kale. Add avocado slices to each bowl and 1 tbsp of hummus, and enjoy!