Heat oven to 350°F Grease a 8 or 9" round pan or springform pan.
Process pecans in food processor - pulse until they are meal - but they won't get quite as small as corn meal.
Add the rest of the dry ingredients and pulse again.
(Note on erythritol: You can do this recipe with all artificial sweetener, but I've begun experimenting with partial erythritol, with success. I haven't tested all different combinations yet, though - it may be that more erythritol is even better.).
Add the wet ingredients and process until well-blended.
Pour into pan and bake. The exact time will vary with the pan. Start checking at about 25 minutes until toothpick inserted in center comes out clean.