Helping @earlsagan

components.child-component-1.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.child-component-2.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

controllers.index.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
  	controllerFoo() {
      this.send('foo');
    }
  } 
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions: {
    foo() {
      alert('Route action called!');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.components.child-component-1.hbs

<h3>Child Component 1</h3>
{{child-component-2 anotherAction=someAction}}

templates.components.child-component-2.hbs

<h4>Child Component 2</h4>
<button {{action anotherAction}}>
Click me!
</button>

templates.index.hbs

<h2>Index</h2>
{{child-component-1 someAction=(action "controllerFoo")}}

twiddle.json

{
  "version": "0.9.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.0",
    "ember-template-compiler": "2.6.0"
  }
}