Preheat oven to 375 degrees. Line a large baking sheet with parchment paper and set aside,
In a medium bowl, whisk together flour, baking soda and salt. Set aside.
In a large bowl, beat butter, brown sugar and granulated sugar until smooth and well combined.
Add the egg and egg yolk and continue to mix until well combined.
Add vanilla extract. Add the dry ingredients and mix well.
Fold in the semi-sweet chocolate pieces, M&M's, pretzels and potato chips.
Scoop dough, using a 1 1/2-inch cookie scoop, onto prepared tray, spacing 2 inches apart.
Bake 8-10 minutes, until cookies are lightly browned around the edges.
Remove from the oven and sprinkle with sea salt, if desired and let cool on the sheet for 2-3 minutes, then remove to wire rack to cool completely.