Begin by preheating oven to 350° F. Grease an 8-inch square baking pan.
Combine the flour, baking powder and salt together in a mixing bowl. Give dry ingredients a stir and set the bowl aside.
In another bowl, combine apple slices, Smucker's Red Plum jam and lemon juice. Mix up so that apples are coated in jam and lemon juice. Set aside.
Beat the eggs well, either with electric beater on medium, or vigorously by hand.
Gradually add sugar and beat (about 2 min.), or mix by hand, till mixture is almost fluffy.
Add oil and vanilla and almond extracts, and continue to beat and scrape side of bowl till all is combined.
Next, mix in the flour mixture (if using electric beater, reduce speed to low). Mix until batter is blended to uniform color and consistency.
Take just half of the batter and spread evenly in the baking pan.
Next, cover the layer of batter with the apple and jam mixture. Then spread the remaining half of the batter over the apples. Give a light shake or two of cinnamon over the surface of the cake.
Bake on the center rack till golden (approximately one hour).
After removing from oven, let the cake cool. Cut into squares and serve.