Prepare the Tomatoes. Slice the tomatoes about ¼-inch thick and lay them on paper towels. Sprinkle lightly with salt and let them sit for 20–30 minutes. This draws out excess moisture so your galette doesn’t become soggy.
Make or Roll Out the Dough. If using homemade dough, chill it for at least 30 minutes before rolling. On a lightly floured surface, roll the dough into a 12-inch circle. Transfer to a parchment-lined baking sheet.
Mix the Cheese Filling. In a small bowl, mix your chosen cheese (like goat cheese or ricotta) with minced garlic, a pinch of salt and pepper, and chopped herbs. Spread the cheese mixture evenly over the dough, leaving a 2-inch border around the edge.
Arrange the Tomatoes. Layer the salted, blotted tomato slices over the cheese in a circular or spiral pattern. Overlap them slightly for a beautiful effect. Drizzle with olive oil and season with a bit more pepper and fresh herbs if desired.
Fold the Edges. Gently fold the edges of the dough up over the tomatoes, pleating as you go. This rustic fold gives the galette its signature shape.
Brush with Egg Wash. Whisk one egg and brush the exposed crust with the egg wash for a golden finish.
Bake. Bake in a preheated 400°F oven for 35–45 minutes, or until the crust is golden and crisp and the tomatoes are tender and slightly caramelized.
Cool and Serve. Let the galette cool for at least 10 minutes before slicing. Garnish with fresh basil leaves and serve warm or at room temperature.