Heat sufficient oil in a kadai.
Deep-fry almonds and cashewnuts individually on medium heat till golden and crisp. Drain on an absorbent paper.
To prepare spice mix, combine castor sugar, garlic powder, chilli powder, onion powder, chaat masala and salt in a bowl and mix well.
Sprinkle some spice mixture over warm fried nuts and mix well. Set aside to cool.
Serve or store in an airtight container.