To cook sweetpotatoes: Use fork to poke holes and place on microwave-safe plate. Microwave potatoes 6-9 minutes, depending on size, until tender. Set aside.
In medium mixing bowl, mix mayonnaise, Greek yogurt and lime juice until well combined. Add green onions, cilantro and Parmesan; set aside.
Heat large skillet over medium heat. Add butter and melt. Add corn then cook 2 minutes.
Add jalapeno to skillet with corn, stir and cook 2 minutes.
Add garlic, chili powder, smoked paprika and salt. Stir and cook 1-2 minutes, until corn starts to lightly brown.
Remove from heat. Add skillet ingredients to bowl with mayo-yogurt mixture. Stir until well combined.
Slice cooked sweetpotatoes open and stuff with corn filling.