In a small bowl combine tomatoes, red onion, jalapeno peppers, and cilantro. Season with lime juice and salt. Mix well. Cover and refrigerate.
Combine the ground chuck with the taco seasoning. Mix well using your hands until the taco seasoning is thoroughly mixed into the meat. Form the burger into small patties. Heat a large skillet to medium-high heat. Cook the hamburger patties turning at least once until they are fully cooked (the internal temperature has reached 165 degrees).
While the burgers are cooking, cut the slider buns in half and spread butter onto the cut side of each bun. Place cut side down into a separate skillet over medium heat and cook until golden brown on the bottom. In a small saucepan heat the nacho cheese over medium-low heat, stirring occasionally.
to assemble the sliders—place each slider patty onto the top of the bottom half of each slider bun.
Spoon some of the nacho cheese over each slider patty and place some of the pico de gallo over the nacho cheese on each slider. Place the top half of the bun on top of the pico de gallo, cut side down.