Prep the pan. Lightly grease a 9-inch tart pan with a removable bottom. If you don’t have one, use a springform pan or a pie dish lined with a circle of parchment.
Make the crust. In a bowl, mix 1 1/2 cups almond flour, 3/4 cup oats, 1/4 teaspoon salt, and 1/2 teaspoon cinnamon.
Stir in 1/4 cup melted coconut oil (or butter) and 3 tablespoons honey or maple syrup until the mixture resembles damp sand.
Press and bake. Press the crust firmly into the pan, pushing up the sides. Prick the base a few times with a fork. Bake at 350°F (175°C) for 12–15 minutes, until lightly golden.
Cool completely.
Optional: Bloom gelatin. If you want a firmer slice, sprinkle 1 teaspoon powdered gelatin over 2 tablespoons cold water. Let it sit 5 minutes to bloom. Warm gently in the microwave for 10–15 seconds until dissolved.
Cool to lukewarm.
Blend the filling. In a blender or food processor, blend 1 1/2 cups Greek yogurt, 1 cup cottage cheese, 1–2 scoops (20–40 g) protein powder, 2–3 tablespoons sweetener, 1 teaspoon vanilla, zest of 1 lemon, 1 tablespoon lemon juice, and a pinch of salt. Blend until silky smooth. Taste and adjust sweetness or lemon.
Add gelatin (if using). With the blender running on low, stream in the lukewarm gelatin.
Blend briefly to combine.
Fill the shell. Pour the filling into the cooled crust and smooth the top. Chill for 2–3 hours, or until set and sliceable.
Prep the fruit. Slice berries and other fruit right before topping. Pat them dry so they don’t weep onto the filling.
Glaze. Warm 2 tablespoons apricot jam with 1 teaspoon lemon juice until fluid, then strain if you want a smooth glaze.
Brush a thin layer onto the fruit after arranging it on the tart.
Serve. Slice with a sharp knife. Wipe the blade between cuts for clean edges. Garnish with torn mint if you like.