PsycInfo has a filter for finding empirical articles. On the search screen, scroll down to the bottom right to find the filter for "Methodology" and select "Empirical." The perform your search, and your results should all be empirical.
Most databases, including OneSearch and ERIC, do NOT have a filter for methodology / empirical articles. Thankfully it's easy to do this on your own. After conducting your search, first use the filter for Peer Reviewed (aka scholarly or academic articles). When looking at individual articles, look to see if there are methods and results sections, where they describe how they conducted the study and how they analyzed the results. If those two sections are there, you can be fairly certain it is an empirical article.
