Gradually add flour to pan; cook 2 minutes, stirring constantly (mixture will be thick) with a whisk. Gradually add broth, stirring constantly. Bring to a boil. Reduce heat; simmer 5 minutes, stirring frequently. Remove from heat.
Add coconut milk and pinch of smoked paprika, stirring with a whisk until blended. Add pasta and chicken; stir until blended. Taste and adjust seasonings as needed. I added a bit more salt and pepper at this point.
Spoon pasta and chicken mixture into a small glass or ceramic baking dish coated with cooking spray. Sprinkle the bread crumbs and coconut flakes evenly over the pasta and chicken mixture.
Bake, uncovered, until golden brown on top and the sauce bubbles, about 25 minutes. Remove casserole from oven; let stand 15 minutes before serving.