Preheat oven to 325°F and line a baking sheet with parchment paper.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the softened butter and allulose on high speed until light and fluffy (about 2 minutes).
Turn the mixer to low speed. Slowly add the almond flour, vanilla extract, and sea salt. Mix until a soft dough forms.
Add the chopped macadamia nuts and sugar-free white chocolate chips. Stir just until incorporated.
Using a cookie scoop, portion the dough onto the prepared baking sheet.
Place a piece of plastic wrap over each cookie and gently press down with the bottom of a glass to slightly flatten.
Bake for about 14 minutes, or until the cookies are set but still soft in the center.
Carefully transfer the cookies to a cooling rack and let them cool for at least 30 minutes. They will firm up as they cool.