01 - 
                In a big bowl, mix together your cold mashed potatoes, chopped vegetables, and diced onion so everything’s blended well.
              
              
              
                02 - 
                Put your pan on medium heat, then toss in the butter and olive oil. Let them melt together and get the pan nice and hot.
              
              
              
                03 - 
                Spread the potato mixture into the pan evenly and let it cook for 10-15 minutes undisturbed, forming a crispy, golden crust at the bottom.
              
              
              
                04 - 
                Carefully turn the mixture to cook the other side for another 5-10 minutes. It’s fine if it falls apart a little—it adds character!
              
              
              
                05 - 
                Taste it, sprinkle on more salt and pepper if needed, and dig in while it's warm and crunchy!