Prep the Chilies: Wash and thoroughly pat the jalapeños dry.
Using a paring knife, make a slit down the length of each chili, being careful not to cut all the way through. Gently scrape out the seeds and white membrane, then rinse and pat dry again.
Make the Spice Paste: In a small bowl, mix together the ground mustard, turmeric, salt, cumin, garam masala, chickpea flour, and yogurt.
Stir until it forms a thick, spreadable paste. Carefully stuff this mixture into the cavity of each chili.
Fry to Perfection: Heat ghee or vegetable oil in a deep pan over medium-high heat to 360°F / 180°C.
Working in batches, carefully fry the stuffed chilies for 2-3 minutes, turning occasionally, until the skin is blistered and golden brown.
Remove with a slotted spoon and drain on a paper towel-lined plate.
Serve hot!