Heat the olive oil in a skillet over medium-high heat.
Add the corn and finely diced jalapeño to the skillet.
Cook for 5 to 7 minutes, stirring occasionally, until the corn begins to char lightly and the jalapeño softens.
Remove the skillet from the heat and set the corn mixture aside to cool slightly.
In a small mixing bowl, combine the mayonnaise, sour cream, lime juice, cumin, smoked paprika, chili powder, salt, and black pepper.
Whisk the dressing until smooth and evenly combined.
Taste the dressing and adjust the salt, pepper, or lime juice if needed.
In a large mixing bowl, add the shredded red cabbage, julienned green bell pepper, chopped cilantro, sliced green onions, crumbled feta cheese, and cooked corn-jalapeño mixture.
Pour the prepared dressing over the slaw ingredients.
Toss thoroughly until all ingredients are evenly coated with the dressing.
Taste the slaw and adjust seasoning if desired.
Serve immediately for the freshest texture, or refrigerate briefly before serving if a chilled slaw is preferred.