Preheat oven to 350 degrees. Thinly slice peaches (I keep skins on, but feel free to peel if you prefer) into a mixing bowl. Drizzle lemon juice over peaches and sprinkle with cinnamon and sugar to taste. Gently stir to combine. Add peach mixture to a greased 8x8 baking pan.
In the same mixing bowl, add melted butter, sugar, flour, egg and salt, and stir until well combined. Do not beat! Batter will be thick.
Using a rubber spatula, cover the fruit with batter, pressing to distribute evenly. Bake at 350 degrees for 35-40 minutes, or until top is crisp and brown. Serve with vanilla ice cream. Enjoy!