Grease a 9 inch Pie Pan with a detachable base with butter and keep aside.

In a large bowl, mix together 1 cup flour, powdered oats, baking powder, salt and sugar.

Add the chilled butter to the flour mixture.

Use your hands and bring together to make a coarse crumb mixture.

Add chilled water, a tablespoon at a time, until a firm dough forms.

Knead for about 5 minutes.

Wrap the dough in a cling wrap and refrigerate it for about 1 hour.

After an hour, place the dough on a well-dusted and floured platform.

Roll the dough out to fit the pie pan.

Lift and place the pie crust dough on the pie pan, press it down, and refrigerate it for about 20 to 30 minutes.

Preheat the Oven to 170 degree Celsius.

After about 20 minutes, prick the crust with fork all over and place the crust in the preheated oven.

Prebake the oat pie crust for about 15 mins.

After about 10 minutes of baking, remove the crust from the oven and brush it with one egg (honey or milk) and put it back in the oven for about 7 mins till it looks set and all shiny.

Once the oat pie crust is baked, remove it from the oven and allow it to cool completely.

In a large bowl, beat the eggs and sugar for 3 to 4 minutes till pale and thick.

Gently fold the yogurt mixed with zest, vanilla extract, nutmeg powder into this until well combined.

Sieve the 3/4 cup flour into the yogurt mixture gradually in three batches, folding it while you go along.

Pour the mixture into the pre-baked tart, arrange the figs and blueberries in the center and put it back into the oven to bake at 170 C for about 30 to 35 minutes till the edges start to turn golden brown and the mixture looks set.

Remove the pie from the oven and cool completely.

Refrigerate the pie for at least 6 hours before serving.

For eggless version, omit the egg and the baking process after that. Combine the yogurt, sugar, vanilla, nutmeg powder along with 2 teaspoons of agar agar or gelatine (dissolved in very little water).

Add the agar agar mixture to the yogurt and combine it well.

Pour the mixture into the prebaked tart crust, top it with fruits and refrigerate until it is set.

Serve the Baked Yogurt Tart with Figs & Blueberries at tea-time or at a dinner party.