Preheat the oven to 350 degrees.
In a small bowl add the milk and dried lavender and let it sit for about 15 minutes. You can also do this the day before and let it infuse in the refrigerator.
In a sieve sift flour, baking powder, and salt into a mixing bowl and set aside.
In a mixing bowl with the paddle attachment, beat butter and sugar on medium speed until light and fluffy.
In a large measuring cup, strain the infused milk and add the egg whites and extracts.
Turn the mixer to low speed and alternate the dry and wet ingredients. Use a spatula to scrape down the sides and bottom of the bowl.
Pour the batter into a 9x9x3 square pan OR two 8×8 round pans to make a layered cake.
Bake the cake for 30 minutes. This may change depending on the pan you’re using. Set the time for 25 minutes and then add more time if needed. Our square 9x9x3 cake took 30 minutes to bake.
Once the cake is done baking and has cooled, turn it upside down and then using a wooden toothpick make 12 little holes in the cake by poking it.
Using a pastry brush, brush the lavender syrup over the cake. You won’t use all of the syrup, but at least 1/2 of it.