Preheat grill to medium-high heat.
In a small bowl, combine all ingredients for the whipped ricotta. Whisk or use an electric hand mixer to beat until fluffy, about 2 to 3 minutes. Set aside in the refrigerator until ready to use.
Drizzle corn with olive oil and place on the grill. Grill for 10 to 15 minutes, turning every few minutes, until cooked through and browned.
When the corn is cool enough to cut, use a knife to remove the kernels from the cob. Add corn to a large bowl with red onion, cilantro, jalapeno, lime juice, cumin, paprika, black pepper, and salt. Stir to combine well.
Spread the toasted bread slices with whipped ricotta, dividing evenly between the slices. Top with corn mixture.
Garnish with cilantro and cojita cheese. Serve.