Pre heat your oven to 350 degrees
sift together the flour, salt, baking soda, baking powder, and then stir in lemon zest.
In a large microwave safe bowl, soften butter for 20-30 seconds. Cream butter, lemon extract, and sugar together for 1 minute until fluffy. Add eggs one at a time to this mixture and combine well.
In another small bowl combine whole milk with ¼ cup lemon juice (it will look curdled but it's fine, you are essentially making buttermilk)
Add half of the flour mixture to the butter/sugar bowl and mix to combine. Add half of the milk and mix. Then add the remaining flour mixture followed by the milk. Mixing well in between each addition.
Carefully stir in sprinkles.
Grease a 9 inch round baking pan very well and pour batter into the pan. Bake for 30 minutes and check for doneness. Bake an additional 5 if it is still raw in the middle.
Let each layer you are using cool COMPLETELY. This is essential.