Preheat your oven to 425°F and line two baking sheets with parchment paper. Pat chicken breasts dry with paper towels, then season generously with garlic powder, paprika, thyme, salt, and pepper on both sides.
On the first baking sheet, toss Brussels sprouts and butternut squash with 1 tbsp olive oil, salt, and pepper until evenly coated. Arrange in a single layer with space between pieces for proper roasting.
Place seasoned chicken on the second baking sheet and drizzle with remaining olive oil. Roast both sheets for 20-25 minutes until chicken reaches 165°F internally and vegetables are golden and tender with crispy edges.
While everything roasts, prepare your hearty fall chicken bowl recipe by combining balsamic vinegar and maple syrup in a small bowl to create the dressing. Whisk until the maple syrup fully dissolves into the vinegar.
Once roasted, remove chicken from the oven and let it rest for 3-5 minutes before slicing into bite-sized pieces. Dice the roasted apple and toss with fresh spinach in a large mixing bowl.
Add the roasted vegetables and chicken to the spinach mixture, then drizzle the balsamic-maple dressing over everything. Toss gently until all components are coated, then divide evenly into four bowls.
Top each fall bowl with pumpkin seeds and dried cranberries just before serving for added crunch and tartness that complements the warm roasted components perfectly.