To make the guacamole, peel the avocado and remove the skin and stone. Add the avocado flesh to a mixing bowl. Finely chop the chili. Add the chili to the bowl with the avocado, 1/2 a teaspoon of lime juice and a pinch of salt and pepper. Crush gently together to combine.
To prepare the salsa, finely dice the tomato and the cucumber and roughly chop the cilantro. Add the tomato and cucumber to a mixing bowl along with the cilantro, 1/2 teaspoon lime juice, and 1 tablespoon olive oil. Season with a little salt and pepper and mix well to combine. You can taste and adjust seasonings as desired.
Add the cauliflower rice to a small saucepan with a tablespoon of water. Set over a medium heat. Add the paprika, oregano, and cumin and a little seasoning to taste. Stir to combine. Cook the rice through for 2-3 minutes until hot through and tender. Drain away any excess liquid and set to one side.
Roughly tear the rotisserie chicken and add to a serving plate or bowl. Add the salsa, guacamole, and cauliflower rice. Add the sour cream and sprinkle over the grated cheddar. Serve immediately.