Heat the oil in a large skillet over medium-high heat. Add the tomato, onion, and pepper and cook, stirring frequently, until the onion begins to soften and brown, about 7 minutes. Add the tequila and cook, stirring, until reduced to a glaze.
Sprinkle in the cheese. Stir slowly and constantly until just melted. Serve immediately in a warm dish. Sprinkle with the cilantro. Enjoy with tortilla chips.