Preheat the oven to 350F/177C convection (325F/163C conventional) and grease and line three 8 inch cake pans with baking spray and parchment paper.
Place the flour, baking powder and sea salt in a medium bowl and whisk them together until they’re evenly distributed.
2 cups (240g) all-purpose flour, 2 tsp baking powder, 1/2 tsp fine sea salt
Place the milk with the butter in a small pot and heat it gently over medium-low heat, for 2-3 minutes, just until the butter is fully melted and the mixture is hot but not yet simmering. Remove from the heat and set aside.
1 cup (240mL) milk, 1/2 cup (113g) salted butter
Place the eggs in the bowl of a stand mixer, fit with the whisk attachment, and begin beating at medium-high speed, until the eggs begin to froth , just a few seconds. Reduce the speed and stream in the sugar.
4 large eggs, 1 3/4 cups (350g) granulated sugar
Add the vanilla extract and turn the mixer up to full speed, allowing it to beat for a few minutes, until the sugar and egg mixture is fluffy and pale.
2 tsp vanilla extract
Sift the dry ingredients over the egg mixture, and now turn the mixer up to low speed while streaming in the milk and butter. Scrape the edge of the bowl and give it one more mix, just until the last streak of flour is combined.
Divide the batter into the prepared pans, about 15-16 ounces each, and bake for 20 minutes, until they're golden brown and spring back when you gently press on the tops.