The secret to the maximized yumminess of this crunchy brittle is using roasted and salted nuts and seeds, which add savory saltiness to meet the sweetness. Note: erythritol can have a "cooling sensation" on the palate for some people, but do not try to substitute other keto-friendly sweeteners or you will not get the crisp and crackly character we like so much in this recipe. Stored at room temperature in an airtight container, the brittle keeps for 5 days.
Line a large (18 by 13-inch) rimmed baking sheet with a silicone mat or parchment paper. Grease the mat or parchment and the head of a silicone spatula with 1 tablespoon of the butter. Set aside.
Combine the remaining 7 tablespoons butter, sweetener, and vanilla in a medium, heavy-bottomed, stainless steel saucepan. Heat over medium heat, stirring constantly, until the sweetener is fully dissolved, 6 to 8 minutes. Continue cooking, stirring constantly, just until the mixture reaches a deep brown/amber color then quickly remove the pan from the heat to avoid burning, 7 to 8 minutes.
Use the buttered spatula to quickly mix in the nuts and seeds, then pour the mixture onto the prepared baking pan. Smooth out the nuts so they are evenly distributed, making sure the brittle mixture is touching all the nuts and seeds. Refrigerate to set, 1 hour.
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