Preheat and prep. Heat your oven to 325°F (165°C).
Line a 12-cup standard muffin tin or a 24-cup mini muffin tin with paper liners. This keeps the crust from sticking and makes serving easy.
Make the crust. In a bowl, mix 1 1/2 cups almond flour, 1/4 cup granulated keto sweetener, a pinch of sea salt, and 5 tablespoons melted butter. Stir until the mixture looks like damp sand and clumps when pressed.
Press and par-bake. Divide the crust among the liners, pressing firmly into an even layer (about 1 tablespoon per standard cup or 1/2 tablespoon for mini).
Bake for 6–8 minutes, until lightly set and just turning golden at the edges. Let cool while you make the filling.
Soften the cream cheese. In a large bowl, beat 16 ounces of softened cream cheese with 1/2 cup granulated keto sweetener until smooth and fluffy. Scrape the bowl to avoid lumps.
Add wet ingredients. Beat in 1/3 cup sour cream and 1 teaspoon vanilla.
Mix just until smooth. Add 2 eggs, one at a time, mixing on low until incorporated. Do not overmix; too much air can cause cracking.
Make the strawberry layer. In a small saucepan, add 1 cup diced strawberries, 1–2 tablespoons powdered sweetener, and 1 teaspoon lemon juice.
Cook over medium heat, stirring, for 5–7 minutes until the berries break down and the mixture thickens. If it looks thin, sprinkle a tiny pinch of xanthan gum and whisk well. Cool slightly.
Assemble. Spoon cheesecake batter over the crusts, filling each about 3/4 full.
Add a small dollop (about 1/2–1 teaspoon) of strawberry mixture on top, then swirl lightly with a toothpick for a marbled look.
Bake gently. Bake standard muffin-size bites for 16–18 minutes (mini for 12–14). The centers should be set at the edges with a slight jiggle in the middle. Avoid browning on top.
Cool and chill. Let the bites cool in the pan for 20 minutes, then transfer to the fridge for at least 2 hours, preferably 4.
Chilling sets the texture and intensifies the flavor.
Garnish and serve. Top with a thin slice of fresh strawberry or a tiny spoonful of the strawberry mixture, if you have extra. Serve cold for the best bite.