Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper or lightly oil it.
In a mixing bowl, combine the cubed chicken with 2 tablespoons of the olive oil, chopped garlic, smoked paprika, 2 teaspoons ground cumin, 1/2 teaspoon chili powder, 1/2 teaspoon chili flakes, and a pinch of sea salt and black pepper; toss to coat evenly.
In a second bowl, toss the sweet potato matchsticks with the remaining 2 tablespoons olive oil, 1 teaspoon seasoned salt (or paprika), and a pinch of black pepper until evenly coated.
Spread the sweet potatoes on one side of the prepared baking sheet in a single layer and roast for 15 minutes.
After 15 minutes, push the potatoes to one side of the sheet. Arrange the seasoned chicken on the empty side and tuck the quartered lemon pieces among the chicken and potatoes.
Return the sheet to the oven and roast another 15–25 minutes, until the chicken is cooked through and the sweet potatoes are tender and crispy at the edges. Use an instant-read thermometer if available; chicken should reach 165°F (74°C).
While the sheet pan finishes, make the avocado goddess sauce: add the avocados, cilantro, basil, jalapeños (if using), lemon juice, 1 teaspoon cumin, and remaining garlic to a blender. Blend until smooth and creamy, adding a little water if needed. Season with salt to taste.
To serve, spread some goddess sauce into bowls and, if desired, a spoonful of hummus or garlic tahini. Top with roasted chicken, sweet potatoes, sliced cucumbers, and extra herbs. Serve with naan or flatbread.