In a mixing bowl, add besan, rice flour, corn flour, red chili powder, turmeric powder, ajwain, baking soda, and salt. Mix well. Gradually add water and whisk to form a smooth, lump-free batter of medium consistency (not too thick or thin).
Dip the paneer cubes into the batter, ensuring they are well coated. Let excess batter drip off before frying.
Heat oil in a deep pan over medium-high heat. To check if the oil is ready, drop a small amount of batter—if it sizzles and rises immediately, the oil is hot enough.
Gently drop the coated paneer cubes into the hot oil. Fry in small batches, flipping occasionally, until they turn golden brown and crispy. Remove and place on a paper towel to absorb excess oil.
Sprinkle with chaat masala and serve with lemon wedges, green chutney, or ketchup for extra flavor. Enjoy your crispy paneer pakora as a delicious tea-time snack.