Preheat the oven to 350º F (177º C). Line an 8 x 8 inch square baking pan with parchment paper and set aside.
To a large mixing bowl, add the flour, sugar, baking soda, baking powder, and salt. Whisk until combined.
1 ¼ cups all-purpose flour, 1 cup granulated sugar, ½ teaspoon baking soda, 1 teaspoon baking powder, ½ teaspoon kosher salt
Add to the bowl the eggs, oil, milk, and vanilla and whisk until thoroughly combined and no dry spots appear. Whisk well until evenly combined.
2 large eggs, ¾ cup vegetable oil, ¾ cup whole milk, 1 tablespoon pure vanilla extract
Pour batter into the prepared baking pan, bang pan on the counter a few times to pop any air bubbles then bake in the preheated oven for 28-30 minutes, or until a toothpick inserted into the center comes out clean.
Allow to cool on a wire cooling rack before slicing or frosting