Pierce potatoes with a fork, and bake at 375 for 1 hour or until tender. Cool potatoes slightly.
Cook cumin seeds in a small skillet over medium heat 1 minute or until toasted.
Combine cumin seeds and next 6 ingredients (through garlic) in a medium bowl; stir well.
Split potatoes lengthwise, cutting to, but not through, other side. Spoon 1/4 cup corn mixture into each potato. Top each serving with 1 tablespoon crema Mexicana.