Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, beat softened butter and cane sugar together for 2–3 minutes until light and fluffy.
Mix in eggs one at a time, then stir in pure vanilla extract.
In a separate bowl, whisk together flour, baking powder, and sea salt.
Gradually add dry ingredients to the butter mixture. Mix until just combined. Do not overmix.
Drop teaspoon-sized portions onto prepared baking sheet. Gently flatten each cookie with the back of a spoon.
Bake for 10–12 minutes, or until edges are lightly golden. For extra crispy vanilla wafers, bake an additional 1–2 minutes.
Allow cookies to cool on the baking sheet for 3–5 minutes before transferring to a wire rack. Let cool fully to crisp.