- Melt 3 tablespoons butter in round 9-inch oven-safe skillet or cake pan.  
- Sprinkle brown sugar evenly over butter.  Arrange nectarine wedges in circular pattern over brown sugar.  
- Combine remaining butter and granulated sugar in mixer bowl; mix thoroughly. 
- Add egg and liqueur and mix 3 to 4 minutes until light and fluffy. 
- Combine flour, baking powder and salt; mix well. 
- Add flour mixture and milk to butter mixture alternately, starting and ending with flour mixture; mix only until smooth.  Spoon batter over nectarines. 
- Bake at 350ºF about 45 minutes or until wooden pick inserted near center comes out clean. 
- Loosen edges and place serving plate over pan.   
- Carefully turn upside down on serving plate. Remove pan. Garnish with lavender blossoms if desired and serve warm.