Preheat the oven to 350 degrees F.
In a food processor, add the ¾ cup sunflower seeds, ¾ cup almond flour, and ¾ cup steel cut oats. Pulse until the mixture is fully incorporated and crumbly.
¾ cup almond flour, ¾ cup sunflower seeds, ¾ cup steel cut oats
Add a tablespoon of butter one at a time to the mixture; fully incorporating between each addition until a dough forms.
4 tbsp butter
Press the dough into a 9” tart pan or three 4” tart pans in an even layer. Create a ¼ inch thick edge. Cover the crust with plastic wrap and chill in the refrigerator for 30 minutes.
Meanwhile, in a food processor, add the ¾ cup feta, 2 tbsp basil, 1 clove garlic, and ¼ cup balsamic vinegar. Blend until a creamy mixture forms. Some small pieces of feta may still be visible.
¾ cup feta, 2 tbsp basil, 1 clove garlic, ¼ cup balsamic vinegar
Remove the chilled crust from the refrigerator and spread the feta mixture into the tart in an even layer.
Press the halved tomatoes into the feta mixture, cut side up.
10 large cherry tomatoes
Bake for 40 minutes until the crust is golden.
Remove from the tart pan and serve.