Let oil heat on sauté high.
Once the oil has heated, add in the onion and celery, and cook until tender for 3-5 minutes.
Add in the carrots and garlic, and cook for 1-2 minutes.
Next, add in the salt, pepper, cayenne pepper, and cumin. Stir until well mixed.
Add in 3 cups of vegetable broth and stir well.
Mix in and level out the cauliflower.
Pressure cook for 5 minutes with a 10-minute natural release.
Stir in the sour cream and cheddar until fully melted.
Use an immersion blender and blend until smooth.
Serve immediately.