In a medium cast-iron skillet, heat oil over medium-high heat. Add mushrooms; cook until slightly tender, about 5 minutes. Remove from heat.
Lightly spray a large piece of parchment paper with cooking spray. On paper, roll one portion of Honey Wheat Pizza Dough to a 15×8-inch rectangle. Lightly spray rolled dough with cooking spray.
Heat a two-burner rectangular cast-iron grill pan over medium-high heat. Invert pizza dough onto grill pan; gently peel of parchment. Cook until grill marks form on bottom of crust, about 2 minutes. Turn crust; remove pan from heat.
Spread alfredo sauce onto cooked side of crust; sprinkle with half of cheese. Top with spinach, mushrooms, and remaining cheese.
Bake pizza on grill pan until crust is browned and crisp and cheese is melted, 8 to 10 minutes. Garnish with red pepper, if desired.
Honey Wheat Pizza Dough
In a small bowl, stir together 1¼ cups water, honey, and yeast; let stand until foamy, about 5 minutes.
In the work bowl of a stand mixer fitted with a dough hook, combine flours and salt. With mixer on low speed, slowly add yeast mixture, beating until combined. Increase speed to medium-high, and beat until a soft, smooth dough forms, about 5 minutes.
Spray a large bowl with cooking spray; add dough, turning to grease top. Cover and let rise in a warm, draft-free place (75°) until doubled in size, about 1 hour.
Punch dough down; divide dough in half.
Notes
KITCHEN TIP-Wrap remaining pizza dough in plastic wrap, and freeze in a resealable plastic bag for up to 1 month. Let dough thaw in refrigerator and then come to room temperature before rolling out.
Recipe by Southern Cast Iron at https://southerncastiron.com/grilled-mushroom-spinach-white-pizza/