In a mixing bowl, combine salt + pepper + onion powder + garlic powder + chili powder + dried mango powder. Set aside.
In a large bowl, add 5 cups of cold water (or tap water + ice cubes). Add potato pieces and let them soak for about an hour.
*After 1 hour* Remove the potatoes and pat-dry using a paper towel.
Set a cast-iron over high heat. Add oil to deep-fry.
Once it's hot, turn down the heat to medium. Add the potatoes and deep-fry for 10-15 minutes, or until golden.
Remove the fried potatoes to a large bowl. Add about 2-3 tablespoons of the masala and toss to mix. You can save the rest of the masala for later use.
Serve hot.
Notes
Prior to deep-frying the potatoes, I soaked them in cold water for about an hour. This removes excess potato starch + prevents them from sticking together and also makes them crispier.
Don’t forget to dry them before you dip them in hot oil. A simple pat-dry using a paper towel works well.