Begin by preheating the oven to 350° F. Grease an 8-inch square baking pan.
Combine the flour, baking powder, and salt in a mixing bowl. Stir dry ingredients and set the bowl aside.
Add apple slices, Smucker's Red Plum jam, and lemon juice in another bowl. Mix up so that apples are coated in jam and lemon juice. Set aside.
Beat the eggs well, either with an electric beater on medium or vigorously by hand.
Gradually add sugar and beat (about two min.), or mix by hand, till the mixture is almost fluffy.
Add oil, vanilla, and almond extracts, and continue to beat and scrape the side of the bowl till all is combined.
Next, mix in the flour mixture (if using an 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. Finally, 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 it from the oven, let the cake cool. Cut into squares and serve.