Using a kitchen knife, carefully chop corn kernels off of cob. Hold one end of the cob and place the other in a medium mixing bowl. The cob should be in a "standing" position. Place the knife on the top of the cob near your hand and carefully but firmly cut down removing the kernels. Repeat with all sides. Set aside.
Thinly dice Roma tomato and red onion. Seed jalapeño peppers and thinly dice. Chop cilantro and crumble cojita cheese. Toss all prepped ingredients in bowl with corn kernels. Drizzle lime juice and sprinkle salt, pepper and chili powder over ingredients. Give the bowl a toss mixing ingredients together.