Make quick buttermilk: pour 2 tablespoons lemon juice or vinegar into a measuring cup, then add whole milk to measure 2 cups total. Stir and let sit 5 minutes. This acid thickens and tangs the milk, creating buttermilk that reacts with baking soda to give lift and a tender crumb.

Whisk dry ingredients: in a large bowl combine 2 cups (240 g) all-purpose flour, 2 tablespoons (25 g) granulated sugar, 2 teaspoons baking powder, 1/2 teaspoon baking soda, and 1 teaspoon fine sea salt. Whisking evenly distributes the leaveners and salt so every pancake rises uniformly — avoid overmixing wet ingredients into the dry without this step.

Temper wet ingredients: in a separate bowl whisk together the 2 cups prepared buttermilk, 2 large eggs, 4 tablespoons (56.8 g) melted unsalted butter (allow it to cool slightly so it doesn't cook the eggs), and 1 teaspoon vanilla if using. Whisking creates an emulsion that helps a consistent, tender batter.

Combine but don't overmix: pour the wet ingredients into the dry and fold with a spatula until just combined — a few small streaks of flour are fine. Overmixing develops gluten in the flour which makes pancakes tough; a slightly lumpy batter yields tender pancakes.

Rest the batter 10 minutes at room temperature. Resting hydrates the flour, allowing the leaveners to start working and air bubbles to form; it yields lighter texture and better browning.

Heat the pan: set a heavy skillet or nonstick pan over medium heat and let it come to temperature for 3–4 minutes. Test by flicking a few drops of water — they should dance and evaporate. Properly preheated pan prevents sticking and produces an evenly browned exterior.

Oil the pan lightly: brush or wipe 1 tablespoon neutral oil (or a little butter) over the surface. Too much fat causes uneven browning; too little and pancakes will stick. Maintain medium heat — if the pan smokes, lower the heat slightly.

Cook pancakes: for each pancake pour about 1/4 cup batter onto the pan. Cook until bubbles form on the surface and the edges look set (about 2–2½ minutes). Flip once and cook 1–1½ more minutes until golden and cooked through. Bubbles and set edges indicate the interior has steamed and is ready to turn without tearing.

Keep warm: if making a large batch, transfer cooked pancakes to a wire rack set over a baking sheet in a 200°F (95°C) oven to stay warm and maintain texture — stacking on a plate traps steam and softens the exterior.

Serve immediately with butter, real maple syrup, and fresh fruit, or your favorite toppings. A squeeze of lemon over berries enhances brightness and balances the richness.