Combine dressing ingredients in a bowl and stir to combine. Place in the fridge until ready to use.
Preheat oven to 450 degrees. Line a baking sheet with foil and coat with non-stick spray. Place potatoes on the baking sheet and coat with olive oil, garlic powder and oregano. Toss to combine. Place in the oven for 30 minutes, flipping halfway through.
Heat up quinoa and beans in a pan over the stove or in a bowl in the microwave.
To assemble: In 4 bowls layer spinach, quinoa, potatoes, beans, red onion, peppers, carrots, cabbage and jalapeños. Top with dressing and serve.