Preheat the oven to 375ºF. Grease the pan with oil and line with parchment paper. Spray or grease the top of the parchment paper too.
In a bowl, combine apples, lemon juice, and lemon zest, mix to get the apples well coated. Set aside.
In another bowl, combine the dry ingredients, flour, baking powder, and a pinch of salt, mix with a whisk to combine well. Also combine the wet ingredients, cream or milk, sour cream, and vanilla. Set aside.
In another bowl, combine butter and sugar, in medium-high speed, cream the butter and sugar until well incorporated. Add eggs one at a time, mix until fluffy and light in color.
Add the flour and cream mixture alternately and about 1/3 at a time to the creamed butter and sugar mixture. Once everything's incorporated, fold in the applesauce and half of the cubed apples.
Pour the batter into a prepared pan. Use a spatula and even out the top. Sprinkle a little bit of flour on the rest of the apples, place them on top of the cake batter. Cover the top of the batter with the cinnamon, pecan, and brown sugar topping.
Bake for 35-40 minutes or until the toothpick inserted comes out clean. Or if the sides are browning and the batter is not jiggly anymore.