Have ready a large skillet.
In the jar of a blender, put 2 cups whole milk, 2 ½ cups all-purpose flour, 3 eggs, ½ cup chopped onion, 2 tablespoons chopped shallot, 1 garlic clove, 1 tablespoon chopped parsley, 1 tablespoon chopped chives, ½ teaspoon salt and ⅛ teaspoon black pepper. Blend until smooth and creamy.
With the machine running, add 2 ½ cups chopped Swiss chard leaves gradually. Blend until mixed. I like to have some small pieces for texture, but you can process it until completely smooth. It's up to you.
Let stand while you preheat the skillet over medium heat.
Drizzle a small amount of the 1 tablespoon olive oil or butter l on the hot skillet and test it. A drop of batter should sizzle immediately.
Pour between ⅛ and ¼ cup of batter onto the skillet for each pancake, depending on the size you want to make them. Mine are small. And, depending on the size of your skillet, you will be able to make 3-4 at a time. Don't overcrowd, leave room to flip them.
Cook until beginning to bubble and dry and curl at the edges, and flip over. Stack them until you finish with all the batter.
Eat them immediately topped with the seasoned sour cream.