These mini pineapple upside-down cakes are perfect for parties or gatherings. The cakes are made in a muffin tin and are topped with a brown sugar and pineapple mixture. The cake batter is made with vanilla extract and buttermilk, which makes it moist and flavorful. The cakes are sweet and tangy, and the pineapple adds a tropical flavor. Serve them warm with a dollop of whipped cream or a scoop of vanilla ice cream for a delicious dessert.