Pistachio Oatmeal Fudge Bars

Preheat the oven to 350°F / 175°C. Butter and line an 8x4" loaf pan with parchment paper.
Brown the butter: In a small saucepan set over medium heat, melt the butter. Stir the butter occasionally until it turns amber in color and develops little brown specks.
Pour the brown butter into a medium sized mixing bowl and set it in the freezer for 5 minutes.
To the brown butter, whisk in the brown sugar and granulated sugar.
Whisk in the egg yolk, milk and vanilla until very well combined.
Add in the flour, oats, baking soda, baking powder, and salt. Use a rubber spatula to fold the mixture together until only a few flour streaks remain. Add in the pistachios, and continue folding just until no flour streaks remain.
Transfer ~⅔ of the cookie dough to the prepared baking pan. Use your hands or the back of a measuring cup to pat the dough down into an even layer. Bake for 12-15 minutes, until the edges start to turn golden brown.
While the first layer is baking, make the fudge.

Add the chocolate, sweetened condensed milk, butter, and salt to a medium sized saucepan.
Place the saucepan over medium heat, and stir occasionally until the mixture is completely melted and smooth. Remove from the heat.
Once the first cookie layer is done baking, pour the fudge over the cookie layer and smooth it out into an even layer.
Place small pieces of the remaining cookie dough randomly over the fudge layer.
Bake for an additional 12-15 minutes or until the dough turns golden brown. Wait for the bars to cool to room temperature before slicing. Serve, and enjoy!