Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking dish to prevent sticking.
In a large skillet over medium-high heat, add the olive oil. Sauté the diced red and yellow bell peppers along with the sliced red onion until they are tender, which should take about 5 minutes. Stir occasionally to ensure even cooking.
Add the sweet corn, cooked rice, kidney or black beans, Kalamata olives, salsa, and taco seasoning to the skillet. Stir well and cook for an additional 2 minutes to heat everything through.
In your greased baking dish, layer half of the Doritos chips on the bottom. Then, top with half of the vegetable and rice mixture.
To make it creamy, soften the cream cheese in the microwave for 30-60 seconds. Spread the softened cream cheese evenly over the rice mixture, followed by one cup of grated Manchego cheese.
Add the remaining vegetable and rice mixture on top of the cream cheese layer, and cover it with the rest of the Doritos and the remaining Manchego cheese.
Cover the dish with aluminum foil and bake it in the preheated oven for 25 minutes. After 25 minutes, remove the foil and bake for an additional 5 minutes or until the cheese is nicely browned and bubbly.
Once baked, let the casserole rest for 5 minutes before serving. This resting time allows the layers to set, making it easier to serve. Garnish with fresh cilantro for an added touch!
Notes
For a spicier kick, add jalapeños or a dash of hot sauce to the vegetable and rice mixture.