1. For the pizza dough: In a mixing bowl, combine the warm water, sugar, and instant yeast. Let it sit for about five minutes until the yeast becomes frothy. In a separate large bowl, whisk together the flour and salt. Make a well in the centre of the flour mixture and pour in the yeast mixture and olive oil. Stir the ingredients together until a dough forms.

2. Transfer the dough on to a lightly floured surface and knead for about five minutes, until it becomes smooth and elastic. Place the dough in a greased bowl, cover it with a kitchen towel, and let it rise in a warm place for about two hours, or until it doubles in size.

3. Preheat your oven to 200 degrees and line a baking sheet with parchment paper. Roll out the pizza dough into a rectangular shape, about a quarter inch thick. Spread the pizza sauce evenly over the dough, leaving a small border around the edges. Layer the diced bell peppers over the sauce and sprinkle the shredded mozzarella cheese on top. Season with dried oregano, salt, and pepper to taste.

4. Starting from one long edge, roll up the dough, forming a log shape. Using a sharp knife, slice the log into two-inch thick pieces. Place the pizza roll-ups on the prepared baking sheet, leaving a little space between each roll-up. Lightly brush the roll-ups with olive oil. Bake in the preheated oven for 15 minutes, or until the roll-ups turn golden brown and the cheese melts. Remove from the oven and let them cool for a few minutes before serving.