Part 1: Making the Homemade Pizza Dough

1. Activate the Yeast: In the bowl of a stand mixer (or a large mixing bowl), combine the warm water, sugar, and yeast. Give it a gentle stir and let it sit for 5-10 minutes. The mixture should become foamy and bubbly. This is called “proofing” and it’s how you know your yeast is alive and active.

2. Combine Ingredients: Once the yeast is proofed, add the flour, olive oil, and salt to the bowl. If using a stand mixer, attach the dough hook and mix on low speed until a shaggy dough forms. Increase the speed to medium and knead for 5-7 minutes. The dough should become smooth, elastic, and pull away from the sides of the bowl. If kneading by hand, mix the ingredients with a wooden spoon until a dough forms, then turn it out onto a lightly floured surface and knead for 8-10 minutes until smooth and elastic.

3. Let it Rise: Lightly grease a large, clean bowl with olive oil. Form the dough into a ball and place it in the bowl, turning it once to coat the top with oil. Cover the bowl with plastic wrap or a damp kitchen towel. Place it in a warm, draft-free spot to rise for 1 to 1.5 hours, or until it has doubled in size.

Part 2: Preparing the Flavor-Packed Filling

1. Sauté the Vegetables: While the dough is rising, prepare the filling. Heat 1 tablespoon of olive oil in a large skillet over medium heat. Add the finely diced onion and bell pepper and cook for 4-5 minutes, until they begin to soften.

2. Cook Down the Mushrooms: Add the finely chopped mushrooms to the skillet. Cook for 5-7 minutes, stirring occasionally. The mushrooms will release a lot of water; continue to cook until most of this water has evaporated. This step is crucial to prevent a soggy filling.

3. Add Aromatics and Seasoning: Stir in the minced garlic and dried Italian seasoning and cook for another minute until fragrant.

4. Combine and Cool: Remove the skillet from the heat. Transfer the cooked vegetable mixture to a mixing bowl. Let it cool for at least 10 minutes. It’s important that the filling isn’t hot when it goes onto the dough. Once cooled, stir in the pizza sauce, shredded mozzarella, and grated Parmesan cheese. Mix until everything is well combined.

Part 3: Assembling and Baking the Rolls

1. Preheat and Prepare: Preheat your oven to 400°F (200°C). Line a large baking sheet with parchment paper.

2. Roll Out the Dough: Once the dough has doubled in size, gently punch it down to release the air. Transfer it to a lightly floured surface. Roll the dough out into a large rectangle, approximately 12×18 inches in size.

3. Spread the Filling: Spread the prepared vegetarian filling evenly over the surface of the dough, leaving about a ½-inch border along all edges.

4. Roll it Up: Starting from one of the long edges, tightly roll the dough into a log. Be firm but gentle to keep the filling contained. Pinch the seam at the end firmly to seal it shut.

5. Slice the Rolls: Using a sharp serrated knife or a piece of unflavored dental floss (which works surprisingly well for a clean cut), slice the log into 12-15 individual rolls, each about 1 to 1.5 inches thick.

6. Arrange and Second Rise: Place the cut rolls onto the prepared baking sheet, leaving a little space between each one. You can place them cut-side up (like a cinnamon roll) or on their side. Cover them loosely with a towel and let them rest for 15-20 minutes. This short second rise makes them extra fluffy.

7. Bake to Perfection: Brush the tops and sides of the rolls with the prepared egg wash. Sprinkle with a little extra Parmesan cheese and dried parsley, if desired. Bake for 20-25 minutes, or until the rolls are a deep golden brown and the cheese in the filling is melted and bubbly.

8. Cool and Serve: Let the pizza rolls cool on the baking sheet for a few minutes before transferring them to a wire rack. They will be extremely hot inside. Serve warm with extra marinara sauce for dipping.