diff --git a/src/bin/ublue.rs b/src/bin/ublue.rs
index 4750138..0d3344b 100644
--- a/src/bin/ublue.rs
+++ b/src/bin/ublue.rs
@@ -2,7 +2,8 @@ use std::{fs, io, path::PathBuf};
 
 use anyhow::Result;
 use clap::{Parser, Subcommand};
-use ublue_rs::Recipe;
+use tera::{Context, Tera};
+use ublue_rs::{Recipe, DEFAULT_CONTAINERFILE};
 
 #[derive(Parser, Debug)]
 #[command(name = "Ublue Builder", author, version, about, long_about = None)]
@@ -40,7 +41,11 @@ fn main() -> Result<()> {
             containerfile,
         } => {
             let recipe: Recipe = serde_yaml::from_str(fs::read_to_string(recipe)?.as_str())?;
-            println!("{:#?}", recipe);
+            println!("{:#?}", &recipe);
+            let context = Context::from_serialize(recipe)?;
+            dbg!(&context);
+            let output = Tera::one_off(DEFAULT_CONTAINERFILE, &context, true)?;
+            println!("{output}");
         }
         CommandArgs::Build { containerfile } => {
             println!("Not yet implemented!");
diff --git a/src/lib.rs b/src/lib.rs
index 72faea0..e0a0e1c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,9 +18,9 @@ pub struct Recipe {
     pub rpm: Rpm,
 
     #[serde(rename = "usr-dir-overlays")]
-    pub usr_dir_overlays: Vec<String>,
+    pub usr_dir_overlays: Option<Vec<String>>,
 
-    pub containerfiles: Containerfiles,
+    pub containerfiles: Option<Containerfiles>,
 
     pub firstboot: FirstBoot,
 }
diff --git a/templates/starting_point.template b/templates/starting_point.template
index 2b3520b..407f52f 100644
--- a/templates/starting_point.template
+++ b/templates/starting_point.template
@@ -4,9 +4,11 @@ ARG RECIPE={{ recipe }}
 
 COPY usr/ /usr
 
+{% if usr_dir_overlays %}
 {% for usr_dir in usr_dir_overlays %}
 COPY {{ usr_dir }}/ /usr
 {% endfor %}
+{% endif %}
 
 COPY ${RECIPE} /usr/share/ublue-os/recipe.yml
 
@@ -22,16 +24,18 @@ COPY --from=gcr.io/projectsigstore/cosign /ko-app/cosign /usr/bin/cosign
 
 COPY scripts /tmp/scripts
 
-{% for containerfile in containerfiles.pre %}
-{{ print_containerfile(containerfile) }}
-{% endfor %}
+{% if continerfiles %}
+	{% for containerfile in containerfiles.pre %}
+{{ print_containerfile(containerfile = containerfile) }}
+	{% endfor %}
+{% endif %}
 
 {% for script in scripts.pre %}
 RUN chmod +x /tmp/scripts/{{ script }} && /tmp/scripts/{{ script }}
 {% endfor %}
 
 {% for repo in rpm.repo %}
-RUN wget "${{{ repo }}//%FEDORA_VERSION%/{{ fedora_verison }}}" -P "/etc/yum.repos.d/"
+RUN wget {% raw %}"${{% endraw %}{{ repo }}//%FEDORA_VERSION%/{{ fedora_verison }}{% raw %}}"{% endraw %} -P "/etc/yum.repos.d/"
 {% endfor %}
 
 RUN rpm-ostree uninstall {% for app in rpm.remove %}{{ app }}{% endfor %}
@@ -42,8 +46,10 @@ RUN rpm-ostree install {% for app in rpm.install %}{{ app }}{% endfor %}
 RUN chmod +x /tmp/scripts/{{ script }} && /tmp/scripts/{{ script }}
 {% endfor %}
 
-{% for containerfile in containerfiles.post %}
-{{ print_containerfile(containerfile) }}
-{% endfor %}
+{% if continerfiles %}
+	{% for containerfile in containerfiles.post %}
+{{ print_containerfile(containerfile = containerfile) }}
+	{% endfor %}
+{% endif %}
 
 RUN rm -rf /tmp/* /var/* && ostree container commit