Making Brown Butter Strawberry Peach Pie is a delightful journey. Follow these simple steps for success:

1. Preheat the Oven: Start by preheating your oven to 375°F (190°C).
2. Prepare Pie Crust: In a mixing bowl, combine the flour, granulated sugar, and salt. Cut in the ½ cup of unsalted butter until crumbly.
3. Add Egg: Stir in the beaten egg until dough forms. Wrap in plastic and chill for 30 minutes.
4. Brown the Butter: In a saucepan, melt the ½ cup of unsalted butter over medium heat. Continue cooking until it turns golden brown and develops a nutty aroma. Set aside to cool slightly.
5. Prepare the Filling: In a large bowl, combine the sliced strawberries and peaches. Add the brown sugar, cornstarch, vanilla extract, lemon juice, and cinnamon (if using). Toss until fruit is coated.
6. Roll out the Dough: On a floured surface, roll out the chilled dough into a circle. Fit it into a 9-inch pie pan, trimming excess crust.
7. Fill the Pie: Pour the fruit mixture into the crust evenly, and drizzle the browned butter over the top.
8. Create a Top Crust: Roll out additional dough and cut into strips for a lattice top or cover with another layer, cutting slits for steam.
9. Brush and Bake: Brush the crust with milk. Bake in the preheated oven for 45-50 minutes until the filling is bubbly and the crust is golden brown.
10. Cool: Remove from the oven and allow to cool for at least an hour before slicing to let the filling set.

These steps will guide you in crafting an incredible Brown Butter Strawberry Peach Pie that will surely captivate your family and friends.