Roast the poblano peppers over your stove top flame, rotating often, until the skins char and blister up, which should take about 10 minutes. If you prefer, you can bake them in the oven until they blacken and blister, approximately 15 minutes. Once roasted, cool the peppers and place them into a plastic bag to steam; this will help loosen their skins.
Peel away the charred skin from the roasted poblano peppers once they have cooled enough to handle. Remove the stems and seeds from each pepper before slicing them into strips about ¾ inch thick.
Heat the oil in a large pan over medium heat. Add the sliced onion and cook for about 5 minutes until they become translucent and soften up nicely.
Stir in minced garlic along with corn kernels into the pan with onions, cooking everything together for just one minute while stirring occasionally.
Add your freshly sliced poblano pepper strips into the pan, stirring continuously for another minute so that they begin to absorb all those wonderful flavors.
Swirl in the crema along with any additional seasonings you've chosen, stirring well to incorporate everything smoothly. Gradually add shredded cheese while constantly stirring until it melts completely through.
Your Rajas con Crema is now ready! Serve it warm on warmed tortillas for an authentic experience that everyone will love.