Place the sweet potatoes on a baking sheet and add 2 Tbsp of cooking oil, cumin, a pinch of salt. Toss to combine, and roast sweet potatoes until slightly browned and fully cooked through.
While potatoes are roasting, zest and juice the lime, and add about 1 tsp of zest and 1 Tbsp of juice to a small bowl. Mix in Greek yogurt, garlic, and 1/4 tsp of salt. Set aside.
Heat a large skillet over medium-high heat, then add 2 Tbsp of cooking oil. Add corn and cook until it is blackened slightly.
Combine cooked sweet potatoes, blackened corn, diced bell pepper, diced onion, black beans, most of the Greek yogurt mixture, and the cilantro in a large bowl. Toss to combine.
Top with more Greek yogurt mixture as desired.
Enjoy immediately and refrigerate leftovers within 2 hours.
Keyword black beans, canned corn, cilantro, cumin, garlic, Greek yogurt, red bell pepper, sweet potatoes