Preheat the oven to 400°F and line a rimmed baking sheet with parchment paper for the bacon and broccoli.
Lay the bacon slices on half of the prepared baking sheet in a single layer, and spread the broccoli florets on the other half.
Drizzle the broccoli with half of the olive oil for the bowl base, season lightly with salt and pepper, and toss to coat, keeping the bacon side separate.
Bake the bacon and broccoli for 15 to 20 minutes, turning the bacon once halfway, until the bacon is crisp and the broccoli is tender and browned at the edges, then transfer the bacon to a plate and roughly chop when cool enough to handle.
While the bacon and broccoli cook, add the chicken pieces to a bowl and toss with olive oil, garlic powder, onion powder, smoked paprika, salt, and pepper until evenly coated.
Heat a large skillet over medium to medium-high heat and, if desired, add a spoonful of rendered bacon fat from the pan for extra flavor.
Add the seasoned chicken to the hot skillet in a single layer and cook, stirring occasionally, for 8 to 10 minutes until the pieces are golden brown and cooked through with no pink in the center, then remove from heat and let rest for a few minutes.
In a mixing bowl, whisk together the mayonnaise, sour cream, heavy cream, dill, parsley, chives, garlic powder, onion powder, salt, and pepper until smooth and creamy, adjusting the thickness with a splash more cream if you prefer a thinner drizzle.
Wipe out the skillet if needed, add the remaining olive oil for the bowl base, and cook the cauliflower rice over medium heat for 5 to 7 minutes until hot, tender, and slightly toasted, seasoning lightly with salt and pepper to taste.
Prepare any fresh greens by roughly chopping the spinach or romaine and dicing the avocado and any optional toppings such as pickled jalapeños.
To assemble the bowls, divide the warm cauliflower rice among four serving bowls and arrange the roasted broccoli and fresh greens over the top or to one side.
Top each bowl with a portion of cooked chicken, chopped crispy bacon, shredded cheddar, avocado, and pickled jalapeños if using.
Drizzle each bowl generously with the homemade ranch dressing and serve immediately, allowing each person to add extra ranch to taste.
For meal prep, store the chicken, bacon, broccoli, cauliflower rice, and ranch dressing in separate airtight containers in the refrigerator for up to 4 days and assemble and reheat components just before serving.