01 - Place peeled and diced potatoes in a large pot, cover with salted water, and bring to a boil. Reduce heat and simmer for about 15 minutes, or until fork-tender.
02 - While the potatoes cook, heat a small skillet over medium heat. Add the diced red bell pepper, jalapeño, and minced garlic. Sauté for 3–4 minutes until softened, then remove from heat.
03 - Drain the cooked potatoes thoroughly in a colander and return them to the pot. Mash until smooth using a potato masher.
04 - Add the milk, sour cream, and shredded cheddar cheese to the mashed potatoes. Stir and mix until creamy and well combined.
05 - Gently fold in the sautéed bell pepper mixture, sliced green onions, ground cumin, smoked paprika, chili powder, salt, and pepper until evenly distributed.
06 - Taste the mashed potatoes and adjust salt, pepper, or spices as needed to suit your preference.
07 - Transfer to a serving bowl, garnish with fresh chopped cilantro if desired, and serve hot.