Gooey Apple Cake

This recipe has become on of my favorites because it's a perfect one when you want a Sunday dessert, but don't really have any ingredients to make something yummy. I've had to improvise on a few things and love it everytime. (ps-- it is also very similar to my mom’s apple cake that I put in the family cookbook, but is a little easier and serves a smaller crowd.)

8 T. butter, divided
1 ½ c. sugar, divided
1 egg
1 c. flour
1 tsp. baking soda
½ tsp. cinnamon
¼ tsp. salt
2 large apples, cored and chopped (I've always only had one apple in my fridge whenever I want to make this and it's still good)
1 c. walnuts (I don't keep these on hand that often, so they get left out)
2 tsp. cornstarch
¼ c. evaporated milk (I think it tastes great with just plain milk)
1 tsp. lemon juice
1 tsp. vanilla

Preheat oven to 350 degrees. Coat a 9-in. square pan with cooking spray. Cream 5 T. of butter and 1 c. sugar. Add egg and beat well. Stir in flour, baking soda, cinnamon, salt, apples, and walnuts. Batter will be stiff. Spoon into prepared pan; smooth top. Bake about 35 minutes.

Combine remaining 3 T. butter, ½ c. sugar, cornstarch, and evaporated milk in a saucepan. Bring to a boil over medium heat. Boil 2 minutes, stirring constantly. Remove from heat; stir in lemon juice and vanilla. Pour over hot cake. Serve warm.