Preheat your oven to 350°F and line a muffin tin with four silicone liners for easy removal.
In a small bowl, stir together the almond flour and maple syrup until a thick, sticky crumble forms.
Press the almond mixture firmly into the bottom of the four liners to create a thin crust layer.
In a medium mixing bowl, whisk the Greek yogurt, protein powder, egg, lemon zest, lemon juice, vanilla, and sea salt until completely smooth.
Gently fold half of the fresh blueberries into the yogurt mixture.
Divide the batter evenly among the four liners and press the remaining blueberries into the tops.
Bake for 22 minutes until the edges are firm and the centers have a slight, custard-like jiggle.
Remove from the oven and allow them to cool at room temperature before refrigerating for at least 2 hours to set.