In a large mixing bowl, whisk together the buttermilk, milk, eggs, and melted butter.
Mix on high speed with a hand mixer for about one minute until combined.
In another bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until the batter is smooth.
The batter will be thick, but that's okay. If it's too thick to spread, add a little milk until you get the desired consistency.
Pour the batter onto a hot griddle (set to 350°F), flipping once bubbles form on the edges.
Aim for pancakes about 5 inches wide, but any size will taste great!