Grapefruit Upside-Down Cake

1/4 c. unsalted butter
1/4 c. brown sugar
2 pink grapefruit
1-1/2 c. Bisquick
1/2 c. sugar
1/3 c. milk
1/4 c. mascarpone cheese
1 egg
2 T. vegetable oil
1 t. vanilla extract

Heat oven to 350 degrees.

In a 9" cake pan, melt butter in oven; sprinkle brown sugar evenly over butter.

Peel and thinly slice grapefruit; fan over bottom of pan.

Combine Bisquick, sugar, milk, mascarpone cheese, egg, vegetable oil, and vanilla. Beat on low to combine, then on medium for 4 minutes, occasionally scraping down sides of bowl. Pour over grapefruit in pan.

Bake 40 minutes or until a toothpick inserted in the center comes out clean. Turn pan over onto a serving plate; leave plan in place for a few minutes so the sugar mixture drizzles over cake. Remove pan and cool 15 minutes before serving.

Serves 8.

Adapted from Family Circle magazine, Jan. 2017, p. 74.