Preheat the oven to 425°F and line two baking sheets with parchment paper.
Add the potatoes, red bell pepper, jalapeño, and cauliflower to a large bowl. Drizzle with 1 tablespoon olive oil and season with cumin, paprika, 1/2 teaspoon garlic powder, and 1/2 teaspoon salt. Toss until evenly coated, then spread the vegetables evenly on one of the prepared baking sheets.
In a separate bowl, add the chickpeas along with 1 tablespoon olive oil, the remaining garlic powder and salt. Toss to coat, then spread them in a single layer on the second baking sheet.
Place both baking sheets in the oven and roast for 15 minutes. Remove from the oven and stir or flip everything for even browning.
Return the pans to the oven. Roast the chickpeas for about 10 minutes more, until lightly crisp, and continue roasting the potatoes and vegetables for another 20-25 minutes, or until tender and golden.
While the veggies roast, add the kale to a bowl and drizzle with lemon juice. Use your hands to massage the kale for 1-2 minutes.
Prepare the dressing by adding all ingredients to a blender. Blend until smooth, adding more water as needed to reach your desired consistency.
To assemble, divide the kale between bowls and top with the roasted vegetables, crispy chickpeas, and dressing.