Preheat the oven to 375°F (190°C) and line a baking sheet with parchment paper.
Mix the flour, baking powder, salt, garlic powder, onion powder, parsley, and black pepper in a large bowl.
Stir in the melted butter and olive oil until the mixture becomes crumbly.
Gradually add the cold water and mix until a smooth dough forms.
Roll the dough very thin on a lightly floured surface.
Cut into small squares or rectangles using a pizza cutter or sharp knife.
Transfer the crackers to the prepared baking sheet and prick each one with a fork.
Sprinkle with flaky sea salt if desired.
Bake for 18–22 minutes until the crackers turn golden brown and crisp.
Cool completely on a wire rack before serving or storing.
