Heat channa masala according to package directions. Heat tortillas by wrapping tortillas in foil and heating through in oven or quickly warming each one on a skillet or griddle until golden brown in spots.
Top tortillas with channa masala, avocado, jalapeños, pickled onions, and white sauce. Garnish with chopped cilantro, if desired.
for the White sauce
Combine all ingredients in a small bowl and season with Kosher salt and freshly ground black pepper. Let flavors meld at least one hour before serving. Can be made ahead of time and refrigerated up to 5 days.