In a medium bowl, whisk together the 1½ cups all-purpose flour, 1¼ cups 1-minute oatmeal, ¼ cup super-fine almond flour, 2 tablespoons malted milk powder, 2 tablespoons corn starch, ½ teaspoon ground cinnamon, and ½ teaspoon baking soda.
In the bowl of a stand mixer fitted with a paddle attachment, cream together 1 cup dark brown sugar, ¾ cup unsalted butter, ½ cup granulated sugar, and 1 teaspoon salt until smooth.
Add in 1 large egg, 2 additional egg yolks, and 1 tablespoon vanilla bean paste and beat until light and creamy. About 5 minutes.
Add the dry ingredients to the wet ingredients a little at a time, mixing between each addition.
Fold in 1 cup peanut butter chips 1 cup semisweet chocolate chips, and ½ cup toffee bits.
Measure the dough with a #8 cookie scoop, or about 5.4 ounces each (see alternative size options in notes - I personally prefer the 3-ounce size). If you'd like, press additional chocolate chips on top of the dough.
Chill uncovered in the fridge for at least 2 hours, preferably 24.
Preheat oven to 350°F and line two large baking sheets with parchment paper. Add 4 cookie dough balls at least 5 inches apart. Bake for 13 to 16 minutes until the edges are golden brown. Begin baking the next batch on the second pan, do not bake two pans at a time.
Press additional chocolate and peanut butter chips into the cookies immediately after removing them from the oven. Then, use a large round cookie cutter to swirl the baked cookies inside to make them nice and round. As soon as the chips melt and soften, sprinkle with flaky sea salt.
Let the cookies cool on the pan for several minutes before transferring to a wire rack. Chill the pan in the freezer for a couple of minutes between batches so you don't put the dough down on a hot pan.