Preheat oven to 375 degrees. Set aside an 8×8 or 8×6 glass baking dish.
In a large mixing bowl, combine the sliced peaches (don’t slice them too thin), sugar, cornstarch, salt, cinnamon, and vanilla. Toss gently and allow to sit while preparing the topping.
To prepare the topping, in a medium size mixing bowl, combine the flour, oats, sugar, brown sugar, crushed Biscoff cookies, cinnamon, and salt. Mix to combine. Using a pastry blender, cut in the cold butter. Mix until medium size clumps remain, about the size of dime, maybe a little bit smaller.
To assemble, pour the peaches into the baking dish, cover with topping. Place in oven and bake for 25-30 minutes. Keep a careful eye on the top, making sure that it doesn’t get too dark- if the peaches are not soft yet and the top is getting too dark, cover with foil. I didn’t have a problem with mine, but all ovens are different!
Remove from oven and allow to cool for 20 minutes before serving warm.
Notes
For a 9×13 pan you will need to double the recipe.