Prep the pan. Heat oven to 325°F (163°C).
Line a 24-cup mini muffin tin with paper liners. Lightly mist with cooking spray for easy release.
Mix the crust. In a bowl, stir together almond flour, sweetener, cinnamon, and salt. Add melted butter and vanilla, then mix until the texture resembles damp sand.
Press and par-bake. Spoon about 1 rounded teaspoon of crust into each liner.
Press firmly with your fingers or the bottom of a measuring spoon. Bake for 6–8 minutes, until lightly golden at the edges. Let cool slightly.
Beat the filling. In a separate bowl, beat cream cheese and sweetener until smooth, about 1–2 minutes.
Add eggs one at a time, mixing just until combined. Blend in sour cream, vanilla, lemon juice, and salt.
Fill the cups. Divide filling evenly among the muffin cups, nearly to the top. Tap the pan gently to release air bubbles.
Bake. Bake 12–15 minutes until the centers are mostly set with a slight jiggle.
Avoid browning on top for the creamiest texture.
Cool. Let them cool in the pan for 15 minutes. Transfer to a rack to cool completely, then chill for at least 2 hours to set.
Top and serve. Add berries, a drizzle of sugar-free sauce, or a sprinkle of shaved chocolate. Enjoy cold for best texture.