How can I make this recipe less dense?

I’ve invented this recipe on my own and it comes out really good as a cake and my husband enjoys them as Madeline’s but sometimes they come out a little bit too dense and I wish they were fluffier. What can I add or remove to achieve this?

I’ve invented this recipe on my own and it comes out really good as a cake and my husband enjoys them as Madeline’s but sometimes they come out a little bit too dense and I wish they were fluffier. What can I add or remove to achieve this?