Preheat the Oven:

Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.

Mix the Dough:

In a mixing bowl, combine the flour, baking powder, and salt. Add the cubed butter and use your fingers or a pastry cutter to incorporate it into the dry ingredients until the mixture resembles coarse crumbs.

Add Water and Oil:

Gradually add water and oil to the mixture, stirring until a smooth dough forms. If the dough is too dry, add water 1 teaspoon at a time until it holds together.

Roll Out the Dough:

Divide the dough in half. Roll out one half on a floured surface into a thin, even sheet about 1/8 inch thick. Transfer it to the prepared baking sheet.

Cut the Crackers:

Use a pizza cutter or sharp knife to cut the dough into small squares or rectangles. Poke holes in each cracker with a fork to prevent puffing during baking.

Add Topping:

Lightly brush the crackers with water and sprinkle with coarse salt.

Bake:

Bake for 10-12 minutes, or until the crackers are golden brown and crisp. Keep a close eye to prevent overbaking.

Cool:

Allow the crackers to cool completely on a wire rack before serving. Repeat with the remaining dough.