Pour muffin mix into a large mixing bowl; form a well in the middle. Crack eggs into the center of the well. Add milk and oil; whisk until everything is just moistened and no dry bits are visible. Fold in remaining ingredients, reserving some cheese for topping the muffins. Scoop mixture into a 12 ct. muffin tin sprayed with cooking spray or lined with paper baking cups; top with remaining cheese. Bake in a preheated 400° oven until golden (about 15 min.). Allow muffins to rest for 20 min. before serving.