Cook the pasta in a large pot according to the package directions.
Drain and transfer to a large bowl.
While pasta is boiling, in a large skillet, melt 3 tablespoons of butter over medium heat.
Continue to cook the butter until browned, the color of deep amber, constantly swirling the pan so it doesn’t burn.
Reduce the heat to low and add the breadcrumbs, parsley, salt, and pepper, stirring to coat them in the butter.
Remove from heat and transfer buttered crumbs to a bowl.
In the same skillet, melt the remaining ½ cup of butter and saute the garlic until it is fragrant, 1-2 minutes.
Add the garlic butter to the bowl of drained pasta and toss to coat completely.
Add half of the Parmesan and half of the buttered breadcrumbs to the pasta, season generously with salt to taste, and toss gently to mix.
Divide the pasta into individual bowls and top with the remaining Parmesan, breadcrumbs, and a drizzle of olive oil. Serve warm.