Template.myTemplate.events({
    'submit #myForm': function(event) {
        event.preventDefault();
        Meteor.call('myMethod', function(error, response) {
            //
        });
    },
});

Meteor.methods({
    myMethod: function() {
        try {
            return (Collection.insert({
                data: 'Hello world'
            })) ? true : false;
        } catch(e) {
            throw new Meteor.Error(e);
        }
    }
});