Below are the steps you should follow to write an impressive expository essay. 1. Choose an engaging topic. The first step is to decide on a topic for your expository essay. This passage might seem like, this is how the -paragraph expository essay should be written. Check it out in detail now. Introduction - Here you present a brief description of your essay. It should end with a strong thesis statement. Paragraphs: Expand the idea in body paragraphs and present evidentiary information. Writing an expository essay can be done step by step by organizing your thoughts, researching the topic, formulating a thesis statement, writing an introduction, composing the body paragraphs, and summarizing the essay in the conclusion. Finally, review and proofread the essay to ensure its quality.1. Read your essay prompt. Most expository essay prompts will ask you to do one of the following: Define and explain a concept or theory. Compare and contrast two ideas. Examine a problem and propose a solution. Describe a cause and effect relationship. Explain a process step by step.