Create a widget at Settings > Widgets > Create New, add your Twitter name, check "Exclude replies, uncheck "Auto-expand photos", then Create Widget, find the data-widget-id attribute and paste in this Gist

single-tweet

<div class="home-tweet">
	<h6>Latest Tweet</h6>
	<a class="twitter-timeline" data-dnt="true" href="[[DIRECT TWITTER PROFILE URL]]" data-widget-id="[[TWITTER WIDGET ID]]" 
	  data-link-color="#ce2029" data-chrome="nofooter noheader noscrollbar noborders transparent" data-tweet-limit="1">
 <script>!function (d, s, id) {
		var js, fjs = d.getElementsByTagName(s)[0], p = /^http:/.test(d.location) ? 'http' : 'https';
		if (!d.getElementById(id)) {
			js = d.createElement(s);
			js.id = id;
			js.src = p + "://platform.twitter.com/widgets.js";
			fjs.parentNode.insertBefore(js, fjs);
		}
	}(document, "script", "twitter-wjs");</script>
</div>