Coat potatoes with spices, and cover with saran wrap. Microwave until potatoes are soft (since microwaves vary upon wattage 7-9 minutes should do).
I like to microwave the frozen spinach in the box that it comes in 7-9 minutes (thats if you forgot to thaw it out). In a doubled paper towel (if it's not Bounty you'll need 4) squeeze the water out from the spinach.
In a saucepan add potatoes and the water that was made from being NUKED in the microwave, add heavy cream or the milk/cornstarch mixture. Add the diced onion and stir. Add drained spinach, 2 teaspoons curry powder, 1 teaspoon minced garlic, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1 teaspoon dried thyme, 1 teaspoon crushed red pepper, 1 teaspoon powdered ginger, 1 teaspoon kosher salt and 1 teaspoon cumin. Stir & Simmer for 5 minutes.