I have used canned chick peas, but you can soak 1/2 cup chickpeas/chana overnight and cook with some salt. Drain chickpeas when done. The Red chili powder adds a bit of heat and color. If you just want color and no heat, use paprika/kashmiri lal mirch. Roasting the garlic cloves along with the red peppers gives a good nutty,garlicky flavor to the hummus.
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