This lavender honey layer cake recipe is perfect for a birthday or anniversary celebration. Using a food processor, mix together flour, sugar, baking powder, and salt. In a separate bowl, whisk together eggs, honey, lavender, and vanilla extract. Combine the wet and dry ingredients in the food processor and mix until smooth. Pour the batter into three greased cake pans and bake for 25-30 minutes. Once cooled, stack the layers and frost with a lavender buttercream frosting made from butter, powdered sugar, lavender extract, and heavy cream.