Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine 6 cups of peeled and sliced peaches with 1 cup of sugar, ¼ cup of water, and 1 tablespoon of fresh lemon juice. Toss gently until well-coated. Let sit for about 15 minutes.

Melt ½ cup of unsalted butter. In a separate bowl, whisk together 1 cup of all-purpose flour, 1 cup of sugar, 1 tablespoon of baking powder, and a pinch of salt. Gradually mix in the melted butter, 1 cup of whole milk, 2 teaspoons of pure vanilla extract, and a sprinkle of ground cinnamon until just combined.

Lightly grease a 9x13-inch baking dish and pour the batter into the bottom. Spoon the peach mixture over the batter without stirring.

Bake in the preheated oven for 45 to 50 minutes or until golden brown and bubbly around the edges.

Remove from oven and let cool for 10 to 15 minutes before serving.