Heat olive oil in a pan. Add the corn kernels, season with salt, turn once or twice and fry without moving until lightly browned on one side, about 2 minutes. Stir in the corn and repeat until the second side is lightly browned, about 2 minutes. Keep stirring until the corn is browned on all sides, about 10 minutes total. Place the corn in a large bowl.
Add the mayonnaise, sugar, feta cheese, spring onions, sliced or chopped jalapeño, garlic, lime juice and Ancho chilli powder to the warm corn and mix. Taste and add more salt, pepper and chilli powder to taste.