A templating solution implemented in JavaScript [207 bytes minified+gzipped]

nano-template.js

// Author: Jared Abbott
// Created: December 2015
// License: MIT
var template = function(tpl, data) {
    // Make sure the cache is available
    var w = window;
    w.tplCache = !w.tplCache ? {} : w.tplCache;

    // Prepare and load the template
    tpl = ('"' + tpl.replace(/\{\{(.*?)\}\}/g, '"+$1+"') + '"').split(/\'+ | + \'/);
    // Generate a function that will serve as a template
    // Introduce the data as local variables using with(){}
    var fn = (!w.tplCache[tpl]) ? new Function("obj", "with(obj){ var tpl = " + tpl + "} return tpl;")(data) : w.tplCache[tpl];
    return fn;
};

// EXAMPLE
var data = {
    name: "Mr. Abbotto",
    profile: {
        age: 969
    },
    food: {
        favourite: 'Cheezbergurz'
    }
}

var tpl='<h1>My name is {{ name }}, and I am {{ profile.age }} years old. My favourite food is {{ food.favourite }}.</h1>';

console.log(template(tpl, data));