Preheat oven to 475°. In a large bowl, whisk together flour, 1/2 cup panko, the garam masala, baking soda, salt, and remaining spices. Whisk in lemon juice and club soda. Set aside.
In a small bowl, use a clean whisk to beat egg whites until foamy.
Whisk whites into flour mixture. Using your hands or a spatula, add cauliflower and combine until all florets are coated. Place remaining panko in a medium bowl. Lift florets, 1 at a time, out of batter and toss to coat with panko.
Place florets on a large nonstick baking sheet coated with oil. Bake until browned and crispy, about 20 minutes. While cauliflower bakes, make Cilantro Mint Dipping Sauce.
Note: Nutritional analysis is per serving without sauce.
Nettie, I haven't made this recipe (nor used panko crumbs before), but when making baked onion rings, I first dip the rings in fine flour (usually rice flour), followed by the beaten egg, then the bread crumbs. It makes a difference and the bread crumbs adhere much better.
I learned that tip from a chef, and it really does make a difference.
I made these to go with some chana masala for dinner tonight. I was unable to find panko at the particular store I went to and didn't feel like going to the asian market so I substituted with the italian style bread crumbs I already had in my pantry which worked fine. I will agree with the other reviewer that these needed more spices, so I doubled the amount of all spices and salt. Before baking I sprayed them down with cooking oil so that they would crisp and baked as directed. They came out pretty tasty. I will probably try these again with the panko. I really liked the fact that they're lower in fat and not fried like traditional pakoras.