01 - Set oven to 350°F and allow to fully preheat.
02 - In a large skillet, melt butter over medium heat and add corn kernels. Sauté for 5 minutes until corn begins to turn golden.
03 - Add diced red bell pepper, sliced green onions, minced garlic, and chopped jalapeño to the skillet. Cook for 2 additional minutes, then remove from heat.
04 - In a large bowl, whisk together sour cream, mayonnaise, egg, chili powder, smoked paprika, ground cumin, salt, and black pepper until smooth.
05 - Gently fold sautéed vegetables, half the cotija or feta cheese, and half the Monterey Jack cheese into the dairy mixture.
06 - Pour the mixture into a greased 9x13-inch baking dish, spreading evenly.
07 - Scatter the remaining cotija or feta cheese and Monterey Jack cheese on top of the mixture.
08 - Place dish in the oven and bake for 30 to 35 minutes, until the casserole is bubbling and the top is golden brown.
09 - Allow casserole to cool for 5 minutes, then garnish with chopped cilantro and serve with lime wedges.