4 Tablespoons unsalted butter, cut into pieces
1/3 cup gf brown sugar, packed
6 crosswise slices of fresh pineapple or 6 canned pineapple slices (about 3 inches in diameter)
1-1/2 cups gf flour
2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1/2 cup
créme fraiche or plain gf yogurt
1/4 cup milk
2 Tablespoons canola oil
1 teaspoon gf vanilla extract
6 Tablespoons unsalted butter
3/4 cup granulated sugar
2 large egg yolks